$TTEK
TETRA TECH INC Stock $ttek

$ttek Overview Financials Valuation SEC Filings Company Website

2013 Q3 Form 10-K Financial Statement

#000104746913010692 Filed on November 20, 2013

Income Statement

Concept	2013 Q3	2013 Q2	2013
Revenue	$698.4M	$614.8M	$2.614B
YoY Change	-2.92%	-1.52%	-3.59%
Cost Of Revenue	$443.6M	$469.4M	$1.758B
YoY Change	5.85%	20.7%	5.69%
Gross Profit	$87.90M	$5.700M	$267.0M
YoY Change	-10.03%	-93.52%	-25.63%
Gross Profit Margin	12.59%	0.93%	10.22%
Selling, General & Admin	$48.20M	$56.70M	$199.7M
YoY Change	-6.41%	8.21%	-5.36%
% of Gross Profit	54.84%	994.74%	74.79%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$15.50M	$8.090M	$62.61M
YoY Change	155.06%	19.08%	10.02%
% of Gross Profit	17.63%	141.93%	23.45%
Operating Expenses	$47.30M	$49.00M	$190.2M
YoY Change	-8.16%	-6.49%	-0.78%
Operating Profit	$40.63M	-$99.88M	$20.22M
YoY Change	-16.18%	-381.02%	-87.85%
Interest Expense	-$2.400M	$2.010M	$8.689M
YoY Change	-269.13%	38.33%	34.84%
% of Operating Profit	-5.91%		42.98%
Other Income/Expense, Net
YoY Change
Pretax Income	$38.30M	-$101.9M	$12.53M
YoY Change	-14.59%	-398.9%	-92.21%
Income Tax	$12.90M	-$23.78M	$14.04M
% Of Pretax Income	33.68%		112.02%
Net Earnings	$25.20M	-$78.12M	-$1.506M
YoY Change	-13.6%	-449.96%	-101.44%
Net Earnings / Revenue	3.61%	-12.71%	-0.06%
Basic Earnings Per Share	$0.39	-$1.21	-$0.03
Diluted Earnings Per Share	$0.39	-$1.21	-$0.03
COMMON SHARES
Basic Shares Outstanding	64.27M shares	64.83M shares	64.54M shares
Diluted Shares Outstanding	64.85M shares	64.83M shares	64.54M shares

Balance Sheet

Concept	2013 Q3	2013 Q2	2013
SHORT-TERM ASSETS
Cash & Short-Term Investments	$129.3M	$146.3M	$129.3M
YoY Change	-8.1%	38.02%	23.38%
Cash & Equivalents	$129.3M	$146.3M	$129.3M
Short-Term Investments
Other Short-Term Assets	$61.40M	$46.40M	$61.40M
YoY Change	25.05%	-25.52%	27.39%
Inventory
Prepaid Expenses
Receivables	$660.8M	$604.3M	$637.5M
Other Receivables	$43.40M	$53.60M	$43.40M
Total Short-Term Assets	$871.6M	$850.6M	$871.6M
YoY Change	1.43%	3.39%	1.43%
LONG-TERM ASSETS
Property, Plant & Equipment	$88.03M	$87.38M	$88.00M
YoY Change	18.46%	20.69%	18.44%
Goodwill	$722.8M	$710.3M
YoY Change	13.65%
Intangibles	$86.93M	$94.75M
YoY Change	17.11%
Long-Term Investments	$2.198M	$2.733M	$2.200M
YoY Change	-32.97%	-24.08%	-33.33%
Other Assets	$27.51M	$25.71M	$27.50M
YoY Change	14.89%	5.35%	15.06%
Total Long-Term Assets	$927.5M	$920.9M	$927.5M
YoY Change	14.26%	22.23%	14.27%
TOTAL ASSETS
Total Short-Term Assets	$871.6M	$850.6M	$871.6M
Total Long-Term Assets	$927.5M	$920.9M	$927.5M
Total Assets	$1.799B	$1.772B	$1.799B
YoY Change	7.66%	12.4%	7.67%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$142.8M	$133.1M	$142.8M
YoY Change	-7.27%	-5.88%	-7.27%
Accrued Expenses	$114.8M	$118.7M	$114.8M
YoY Change	-6.21%	22.12%	-10.38%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$4.300M	$4.000M	$4.300M
YoY Change	86.96%	81.82%	115.0%
Total Short-Term Liabilities	$483.1M	$462.2M	$483.1M
YoY Change	-4.1%	-0.53%	-4.11%
LONG-TERM LIABILITIES
Long-Term Debt	$203.4M	$208.4M	$203.4M
YoY Change	44.77%	93.14%	151.11%
Other Long-Term Liabilities	$24.69M	$29.06M	$83.20M
YoY Change	-4.77%	-18.6%	97.62%
Total Long-Term Liabilities	$24.69M	$29.06M	$286.6M
YoY Change	-4.77%	-79.76%	132.82%
TOTAL LIABILITIES
Total Short-Term Liabilities	$483.1M	$462.2M	$483.1M
Total Long-Term Liabilities	$24.69M	$29.06M	$286.6M
Total Liabilities	$507.8M	$491.3M	$801.3M
YoY Change	-4.13%	-22.91%	22.88%
SHAREHOLDERS EQUITY
Retained Earnings	$552.2M	$527.0M
YoY Change	-0.39%
Common Stock	$443.7M	$458.1M
YoY Change	2.33%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$997.8M	$976.1M	$997.8M
YoY Change
Total Liabilities & Shareholders Equity	$1.799B	$1.772B	$1.799B
YoY Change	7.66%	12.4%	7.67%

Cashflow Statement

Concept	2013 Q3	2013 Q2	2013
OPERATING ACTIVITIES
Net Income	$25.20M	-$78.12M	-$1.506M
YoY Change	-13.6%	-449.96%	-101.44%
Depreciation, Depletion And Amortization	$15.50M	$8.090M	$62.61M
YoY Change	155.06%	19.08%	10.02%
Cash From Operating Activities	$22.50M	$53.30M	$137.8M
YoY Change	-60.39%	61.03%	-12.78%
INVESTING ACTIVITIES
Capital Expenditures	-$7.000M	-$6.900M	$27.55M
YoY Change	1.45%	102.94%	9.71%
Acquisitions			$171.3M
YoY Change			211.43%
Other Investing Activities	-$2.400M	$200.0K	-$169.1M
YoY Change	-95.18%	-150.0%	209.14%
Cash From Investing Activities	-$9.400M	-$6.600M	-$196.6M
YoY Change	-83.42%	73.68%	146.37%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$4.007M
YoY Change			-77.94%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-30.10M	-58.10M	85.60M
YoY Change	-184.79%	91.75%	-227.0%
NET CHANGE
Cash From Operating Activities	22.50M	53.30M	137.8M
Cash From Investing Activities	-9.400M	-6.600M	-196.6M
Cash From Financing Activities	-30.10M	-58.10M	85.60M
Net Change In Cash	-17.00M	-11.40M	26.80M
YoY Change	-147.75%	1040.0%	148.15%
FREE CASH FLOW
Cash From Operating Activities	$22.50M	$53.30M	$137.8M
Capital Expenditures	-$7.000M	-$6.900M	$27.55M
Free Cash Flow	$29.50M	$60.20M	$110.3M
YoY Change	-53.69%	64.93%	-17.04%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	23940000	USD
CY2012Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	154003000	USD
CY2012Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	128086000	USD
CY2012Q3	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	20809000	USD
CY2012Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	72549000	USD
CY2012Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q3	us-gaap	Liabilities Current LiabilitiesCurrent	503794000	USD
CY2012Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2012Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	24268000	USD
CY2012Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	25922000	USD
CY2012Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2013Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2013Q3	us-gaap	Liabilities Current LiabilitiesCurrent	483133000	USD
CY2013Q3	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q3	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q3	us-gaap	Common Stock Value CommonStockValue	638000	USD
CY2012Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	433009000	USD
CY2012Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2012Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	31017000	USD
CY2012Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	63837000	shares
CY2012Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	63837000	shares
CY2012Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	554306000	USD
CY2012Q3	us-gaap	Stockholders Equity StockholdersEquity	1018970000	USD
CY2012Q3	us-gaap	Minority Interest MinorityInterest	897000	USD
CY2012Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	1019867000	USD
CY2012Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1671030000	USD
CY2013Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2013Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1799092000	USD
CY2013Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2013Q3	us-gaap	Stockholders Equity StockholdersEquity	997763000	USD
CY2012Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	48168000	USD
CY2012Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5817000	USD
CY2012Q3	us-gaap	Assets Current AssetsCurrent	859313000	USD
CY2012Q3	us-gaap	Equity Method Investments EquityMethodInvestments	3279000	USD
CY2012Q3	us-gaap	Goodwill Goodwill	635958000	USD
CY2012Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	74231000	USD
CY2012Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	2000000	shares
CY2012	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	29000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-13955000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-13517000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	79465000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	131024000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	26292000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-30712000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-29206000	USD
CY2011	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	492000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	3435000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	76030000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	381000	USD
CY2013Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	150000000	shares
CY2013Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2013Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2013Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2013Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	64134000	shares
CY2013Q3	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	20044000	USD
CY2013Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	64134000	shares
CY2012	ttek	Subcontractor Costs SubcontractorCosts	689005000	USD
CY2012	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	1663065000	USD
CY2012	ttek	Selling General And Administrative Expenses Including Depreciation And Amortization Of Intangible Assets SellingGeneralAndAdministrativeExpensesIncludingDepreciationAndAmortizationOfIntangibleAssets	210970000	USD
CY2012	ttek	Fair Value Adjustments To Contingent Consideration FairValueAdjustmentsToContingentConsideration	19246000	USD
CY2011	ttek	Fair Value Adjustments To Contingent Consideration FairValueAdjustmentsToContingentConsideration	1755000	USD
CY2011	ttek	Selling General And Administrative Expenses Including Depreciation And Amortization Of Intangible Assets SellingGeneralAndAdministrativeExpensesIncludingDepreciationAndAmortizationOfIntangibleAssets	193286000	USD
CY2011	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	1454374000	USD
CY2011	ttek	Subcontractor Costs SubcontractorCosts	780817000	USD
CY2012	us-gaap	Investment Income Interest InvestmentIncomeInterest	873000	USD
CY2011	us-gaap	Investment Income Interest InvestmentIncomeInterest	879000	USD
CY2011	us-gaap	Interest Expense InterestExpense	6809000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	140492000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	160796000	USD
CY2012	us-gaap	Interest Expense InterestExpense	6444000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	12532000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	104732000	USD
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	352000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	2943000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	92982000	USD
CY2013	us-gaap	Profit Loss ProfitLoss	-1506000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	26486000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	438000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	130643000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-31300000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	55684000	USD
CY2011	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-293000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	56902000	USD
CY2012	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-286000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	4802000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	10582000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	104000	USD
CY2013	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToNoncontrollingInterest	-47000	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	624000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	10839000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	3194000	USD
CY2011	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	3733000	USD
CY2012	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4768000	USD
CY2011	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-1288000	USD
CY2012	ttek	Fair Value Adjustment To Assets Held For Sale FairValueAdjustmentToAssetsHeldForSale	3437000	USD
CY2012	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	139000	USD
CY2012	ttek	Lease Termination Costs And Related Asset Impairment Charges LeaseTerminationCostsAndRelatedAssetImpairmentCharges	1261000	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-191000	USD
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	231000	USD
CY2011	ttek	Lease Termination Costs And Related Asset Impairment Charges LeaseTerminationCostsAndRelatedAssetImpairmentCharges	1281000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	39960000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-2046000	USD
CY2011	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	28324000	USD
CY2012	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-26284000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-14529000	USD
CY2012	ttek	Increase Decrease In Accrued Compensation IncreaseDecreaseInAccruedCompensation	15678000	USD
CY2012	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	2425000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	7371000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	2665000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	158021000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	131623000	USD
CY2011	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	10553000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	6475000	USD
CY2011	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	-1669000	USD
CY2011	ttek	Increase Decrease In Accrued Compensation IncreaseDecreaseInAccruedCompensation	11157000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-34013000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	137750000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	25106000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	18901000	USD
CY2011	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	269996000	USD
CY2011	us-gaap	Payments For Hedge Investing Activities PaymentsForHedgeInvestingActivities	4216000	USD
CY2011	us-gaap	Proceeds From Hedge Investing Activities ProceedsFromHedgeInvestingActivities	3923000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	5000000	USD
CY2011	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	530000	USD
CY2011	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	879000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-293841000	USD
CY2012	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	55014000	USD
CY2012	us-gaap	Payments For Hedge Investing Activities PaymentsForHedgeInvestingActivities	4192000	USD
CY2012	us-gaap	Proceeds From Hedge Investing Activities ProceedsFromHedgeInvestingActivities	3906000	USD
CY2012	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	430000	USD
CY2012	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1037000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-79799000	USD
CY2013	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-754000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	21489000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-196605000	USD
CY2011	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	43047000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	67618000	USD
CY2011	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	1702000	USD
CY2011	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	104000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	8378000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	31351000	USD
CY2012	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	120792000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	52672000	USD
CY2012	ttek	Payments Of Earn Out Liabilities PaymentsOfEarnOutLiabilities	18055000	USD
CY2012	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	9000	USD
CY2012	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	624000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	18166000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	-67394000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities Continuing Operations NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	85615000	USD
CY2012	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	3526000	USD
CY2011	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	428000	USD
CY2013	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	24457000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	14354000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-130439000	USD
CY2011	us-gaap	Interest Paid Net InterestPaidNet	4226000	USD
CY2011	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	33715000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	5279000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	58126000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	35796000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	748133000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	855250000	USD
CY2011	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	-4567000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-194000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-389000	USD
CY2011	us-gaap	Variable Interest Entity Initial Consolidation Gain Or Loss VariableInterestEntityInitialConsolidationGainOrLoss	670000	USD
CY2011	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	438000	USD
CY2013	us-gaap	Nature Of Operations NatureOfOperations	<div style="font-size:10.0pt;font-family:Times New Roman;"> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2"><b>1.           Description of Business</b></font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2">              We are a leading provider of consulting, engineering, program management, construction management, construction and technical services that focuses on addressing fundamental needs for water, the environment, energy, infrastructure and natural resources. We are a full-service company that leads with science. We typically begin at the earliest stage of a project by identifying technical solutions to problems and developing execution plans tailored to our clients' needs and resources. Our solutions may span the entire life cycle of consulting and engineering projects and include applied science, research and technology, engineering, design, construction management, construction, operations and maintenance, and information technology.</font></p> </div>
CY2013	us-gaap	Fiscal Period FiscalPeriod	<div style="font-size:10.0pt;font-family:Times New Roman;"> <font size="2"><b><i> Fiscal Year.</i></b></font><font size="2">    We report results of operations based on 52 or 53-week periods ending on the Sunday nearest September 30. Fiscal years 2013, 2012 and 2011 each contained 52 weeks.</font> </div>
CY2013	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-size:10.0pt;font-family:Times New Roman;"> <font size="2"><b><i>Use of Estimates.</i></b></font><font size="2">    The preparation of financial statements in conformity with U.S. GAAP requires us to make estimates and assumptions. These estimates and assumptions affect the amounts reported in our consolidated financial statements and accompanying notes. Although such estimates and assumptions are based on management's best knowledge of current events and actions we may take in the future, actual results could differ materially from those estimates.</font> </div>
CY2013	us-gaap	Revenue Recognition Long Term Contracts RevenueRecognitionLongTermContracts	<div style="font-size:10.0pt;font-family:Times New Roman;"> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2"><b><i> Revenue Recognition and Contract Costs.</i></b></font><font size="2">    We recognize revenue for most of our contracts using the percentage-of-completion method, primarily based on contract costs incurred to date compared to total estimated contract costs. We generally utilize the cost-to-cost approach to estimate the progress towards completion in order to determine the amount of revenue and profit to recognize. Revenue and cost estimates for each significant contract are reviewed and reassessed quarterly. Changes in those estimates could result in recognition of cumulative catch-up adjustments to the contract's inception-to-date revenue, costs and profit in the period in which such changes are made. Changes in revenue and cost estimates could also result in a projected loss that would be recorded immediately in earnings. For fiscal years 2013, 2012 and 2011, we recognized net favorable (unfavorable) operating income adjustments of ($40.1) million, $0.5 million and ($8.6) million, respectively, due to changes in estimates.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2">              Certain of our contracts are service-related contracts, such as providing operations and maintenance services or a variety of technical assistance services. Our service contracts are accounted for using the proportional performance method under which revenue is recognized in proportion to the number of service activities performed, in proportion to the direct costs of performing the service activities, or evenly across the period of performance depending upon the nature of the services provided.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2">              We recognize revenue for work performed under three major types of contracts: fixed-price, time-and-materials and cost-plus.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2"><i>              Fixed-Price.</i></font><font size="2">    We enter into two major types of fixed-price contracts: FFP and FPPU. Under FFP contracts, our clients pay us an agreed fixed-amount negotiated in advance for a specified scope of work. We generally recognize revenue on FFP contracts using the percentage-of-completion method. If the nature or circumstances of the contract prevent us from preparing a reliable estimate at completion, we will delay profit recognition until adequate information about the contract's progress becomes available. Under our FPPU contracts, clients pay us a set fee for each service or production transaction that we complete. Accordingly, we recognize revenue under FPPU contracts as we complete the related service or production transactions, generally using the proportional performance method.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2"><i>              Time-and-Materials.</i></font><font size="2">    Under time-and-materials contracts, we negotiate hourly billing rates and charge our clients based on the actual time that we spend on a project. In addition, clients reimburse us for our actual out-of-pocket costs for materials and other direct incidental expenditures that we incur in connection with our performance under the contract. The majority of our time-and-material contracts are subject to maximum contract values and, accordingly, revenue under these contracts is generally recognized under the percentage-of-completion method. However, time and materials contracts that are service-related contracts are accounted for utilizing the proportional performance method. Revenue on contracts that are not subject to maximum contract values is recognized based on the actual number of hours we spend on the projects plus any actual out-of-pocket costs of materials and other direct incidental expenditures that we incur on the projects. Our time-and-materials contracts also generally include annual billing rate adjustment provisions.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2"><i>              Cost-Plus.</i></font><font size="2">    Under cost-plus contracts, we are reimbursed for allowable or otherwise defined costs incurred plus a fee or mark-up. The contracts may also include incentives for various performance criteria, including quality, timeliness, ingenuity, safety and cost-effectiveness. In addition, our costs are generally subject to review by our clients and regulatory audit agencies, and such reviews could result in costs being disputed as non-reimbursable under the terms of the contract. Revenue for cost-plus contracts is recognized at the time services are performed based upon the amounts we expect to realize using the percentage-of-completion method. Revenue is not recognized for non-recoverable costs. Performance incentives are included in our estimates of revenue when their realization is reasonably assured.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2">              If estimated total costs on any contract indicate a loss, we recognize the entire estimated loss in the period the loss becomes known. The cumulative effect of revisions to revenue; estimated costs to complete contracts, including penalties, incentive awards, change orders, claims, liquidated damages, anticipated losses, and other revisions are recorded in the period in which the revisions are identified and the loss can be reasonably estimated. Such revisions could occur in any reporting period and the effects may be material depending on the size of the project or the adjustment.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2">              Once contract performance is underway, we may experience changes in conditions, client requirements, specifications, designs, materials and expectations regarding the period of performance. Such changes are "change orders" and may be initiated by us or by our clients. In many cases, agreement with the client as to the terms of change orders is reached prior to work commencing; however, sometimes circumstances require that work progress without obtaining client agreement. Revenue related to change orders is recognized as costs are incurred. Change orders that are unapproved as to both price and scope are evaluated as claims.</font></p> <p style="TEXT-ALIGN: justify; FONT-FAMILY: times;"><font size="2">              Claims are amounts in excess of agreed contract prices that we seek to collect from our clients or other third parties for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price, or other causes of unanticipated additional costs. Revenue on claims is recognized only to the extent that contract costs related to the claims have been incurred and when it is probable that the claim will result in a bona fide addition to contract value that can be reliably estimated. No profit is recognized on a claim until final settlement occurs. This can lead to a situation in which costs are recognized in one period and revenue is recognized in a subsequent period when a client agreement is obtained or a claims resolution occurs.</font></p> </div>
CY2013Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	4500000	USD
CY2012Q3	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	5000000	USD
CY2013	ttek	Billings In Excess Of Cost Period For Revenue Recognition BillingsInExcessOfCostPeriodForRevenueRecognition	P12M
CY2013	ttek	Concentration Of Credit Risk Number Of Financial Institutions For Investment Exposure ConcentrationOfCreditRiskNumberOfFinancialInstitutionsForInvestmentExposure	1	item
CY2013	ttek	Length Of Fiscal Year Low End Of Range LengthOfFiscalYearLowEndOfRange	P364D
CY2013	ttek	Length Of Fiscal Year High End Of Range LengthOfFiscalYearHighEndOfRange	P371D
CY2013	ttek	Length Of Fiscal Year LengthOfFiscalYear	P364D
CY2012	ttek	Length Of Fiscal Year LengthOfFiscalYear	P364D
CY2011	ttek	Length Of Fiscal Year LengthOfFiscalYear	P364D
CY2013	ttek	Number Of Types Of Contracts For Revenue Recognition NumberOfTypesOfContractsForRevenueRecognition	3	item
CY2013	ttek	Number Of Types Of Fixed Price Contracts NumberOfTypesOfFixedPriceContracts	2	item
CY2012Q3	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	355793000	USD
CY2012Q3	us-gaap	Contract Receivable Retainage ContractReceivableRetainage	17908000	USD
CY2012Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	736032000	USD
CY2012Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	35552000	USD
CY2012Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	700480000	USD
CY2012Q3	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	90909000	USD
CY2013Q3	ttek	Percentage Of Account Receivables Due From Agencies PercentageOfAccountReceivablesDueFromAgencies	0.22	pure
CY2013	ttek	Number Of Levels Below Reportable Segments For Goodwill Impairment Testing NumberOfLevelsBelowReportableSegmentsForGoodwillImpairmentTesting	1	item
CY2013	ttek	Number Of Steps Involved In Process Of Goodwill Annual Impairment Test NumberOfStepsInvolvedInProcessOfGoodwillAnnualImpairmentTest	2	item
CY2013Q2	us-gaap	Stock Repurchase Program Authorized Amount StockRepurchaseProgramAuthorizedAmount	100000000	USD
CY2013	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	855200	shares
CY2013	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	23.39
CY2013	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	20000000	USD
CY2012Q3	us-gaap	Billed Contract Receivables BilledContractReceivables	362331000	USD
CY2012Q3	us-gaap	Billings In Excess Of Cost Noncurrent BillingsInExcessOfCostNoncurrent	4410000	USD
CY2012Q3	us-gaap	Billings In Excess Of Cost BillingsInExcessOfCost	95319000	USD
CY2013Q3	us-gaap	Billed Contract Receivables BilledContractReceivables	375149000	USD
CY2013Q3	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	306969000	USD
CY2013Q3	us-gaap	Contract Receivable Retainage ContractReceivableRetainage	23353000	USD
CY2013Q3	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	705471000	USD
CY2013Q3	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	44624000	USD
CY2013Q3	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	660847000	USD
CY2013Q3	us-gaap	Billings In Excess Of Cost Current BillingsInExcessOfCostCurrent	79507000	USD
CY2013Q3	us-gaap	Billings In Excess Of Cost BillingsInExcessOfCost	79507000	USD
CY2012Q3	ttek	Government Contract Receivable Unbilled Amounts Related To Claims And Requests For Equitable Adjustment On Contract GovernmentContractReceivableUnbilledAmountsRelatedToClaimsAndRequestsForEquitableAdjustmentOnContract	21000000	USD
CY2013Q3	ttek	Government Contract Receivable Unbilled Amounts Related To Claims And Requests For Equitable Adjustment On Contract GovernmentContractReceivableUnbilledAmountsRelatedToClaimsAndRequestsForEquitableAdjustmentOnContract	41000000	USD
CY2013	ttek	Loss On Government Contract Receivable Unbilled Amounts Related To Claims And Requests For Equitable Adjustment LossOnGovernmentContractReceivableUnbilledAmountsRelatedToClaimsAndRequestsForEquitableAdjustment	30200000	USD
CY2012Q3	ttek	Government Contract Receivable Billed Amounts GovernmentContractReceivableBilledAmounts	65900000	USD
CY2012Q3	us-gaap	Government Contract Receivable Unbilled Amounts GovernmentContractReceivableUnbilledAmounts	100400000	USD
CY2012	ttek	Concentration Risk Number Of Clients ConcentrationRiskNumberOfClients	0	item
CY2012	ttek	Concentration Of Risk Accounts Receivable Percentage Minimum ConcentrationOfRiskAccountsReceivablePercentageMinimum	0.10	pure
CY2013Q3	ttek	Government Contract Receivable Billed Amounts GovernmentContractReceivableBilledAmounts	50500000	USD
CY2013Q3	us-gaap	Government Contract Receivable Unbilled Amounts GovernmentContractReceivableUnbilledAmounts	79300000	USD
CY2013	ttek	Concentration Risk Number Of Clients ConcentrationRiskNumberOfClients	0	item
CY2013	ttek	Concentration Of Risk Accounts Receivable Percentage Minimum ConcentrationOfRiskAccountsReceivablePercentageMinimum	0.10	pure
CY2013Q3	us-gaap	Business Combination Contingent Consideration Arrangements Range Of Outcomes Value High BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh	101300000	USD
CY2013Q3	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Current BusinessAcquisitionContingentConsiderationPotentialCashPaymentCurrent	23281000	USD
CY2012Q3	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Current BusinessAcquisitionContingentConsiderationPotentialCashPaymentCurrent	35407000	USD
CY2013Q3	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Noncurrent BusinessAcquisitionContingentConsiderationPotentialCashPaymentNoncurrent	58508000	USD
CY2012Q3	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Noncurrent BusinessAcquisitionContingentConsiderationPotentialCashPaymentNoncurrent	16132000	USD
CY2013	ttek	Business Acquisition Contingent Consideration Actual Cash Payment Reported As Cash Flows From Financing Activities BusinessAcquisitionContingentConsiderationActualCashPaymentReportedAsCashFlowsFromFinancingActivities	33672000	USD
CY2011Q4	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Current And Noncurrent BusinessAcquisitionContingentConsiderationPotentialCashPaymentCurrentAndNoncurrent	75159000	USD
CY2012Q3	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Current And Noncurrent BusinessAcquisitionContingentConsiderationPotentialCashPaymentCurrentAndNoncurrent	51539000	USD
CY2010Q4	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Current And Noncurrent BusinessAcquisitionContingentConsiderationPotentialCashPaymentCurrentAndNoncurrent	20504000	USD
CY2013Q3	ttek	Business Acquisition Contingent Consideration Potential Cash Payment Current And Noncurrent BusinessAcquisitionContingentConsiderationPotentialCashPaymentCurrentAndNoncurrent	81789000	USD
CY2012	ttek	Estimated Earn Out Liabilities For Acquisitions During The Period EstimatedEarnOutLiabilitiesForAcquisitionsDuringThePeriod	18981000	USD
CY2011	ttek	Estimated Earn Out Liabilities For Acquisitions During The Period EstimatedEarnOutLiabilitiesForAcquisitionsDuringThePeriod	55622000	USD
CY2012	ttek	Increase Decrease In Fair Value Of Contingent Consideration Reported In Interest Expense IncreaseDecreaseInFairValueOfContingentConsiderationReportedInInterestExpense	1374000	USD
CY2011	ttek	Increase Decrease In Fair Value Of Contingent Consideration Reported In Interest Expense IncreaseDecreaseInFairValueOfContingentConsiderationReportedInInterestExpense	1612000	USD
CY2012	ttek	Increase Decrease In Fair Value Of Contingent Consideration Reported In Operating Income IncreaseDecreaseInFairValueOfContingentConsiderationReportedInOperatingIncome	-19246000	USD
CY2011	ttek	Increase Decrease In Fair Value Of Contingent Consideration Reported In Operating Income IncreaseDecreaseInFairValueOfContingentConsiderationReportedInOperatingIncome	-1755000	USD
CY2012	ttek	Foreign Currency Transaction And Translation Adjustment ForeignCurrencyTransactionAndTranslationAdjustment	3027000	USD
CY2011	ttek	Foreign Currency Transaction And Translation Adjustment ForeignCurrencyTransactionAndTranslationAdjustment	-743000	USD
CY2013	ttek	Increase Decrease In Fair Value Of Contingent Consideration Reported In Operating Income IncreaseDecreaseInFairValueOfContingentConsiderationReportedInOperatingIncome	-9560000	USD
CY2013	ttek	Foreign Currency Transaction And Translation Adjustment ForeignCurrencyTransactionAndTranslationAdjustment	-2480000	USD
CY2012	ttek	Business Acquisition Contingent Consideration Actual Cash Payment Reported As Cash Flows From Financing Activities BusinessAcquisitionContingentConsiderationActualCashPaymentReportedAsCashFlowsFromFinancingActivities	18055000	USD
CY2013	ttek	Business Acquisition Contingent Consideration Actual Cash Payment Reported As Cash Flows From Operating Activities BusinessAcquisitionContingentConsiderationActualCashPaymentReportedAsCashFlowsFromOperatingActivities	695000	USD
CY2013	ttek	Business Acquisition Contingent Consideration Actual Cash Payment Reported As Cash Flows From Investing Activities BusinessAcquisitionContingentConsiderationActualCashPaymentReportedAsCashFlowsFromInvestingActivities	1279000	USD
CY2013	ttek	Contract Termination Costs ContractTerminationCosts	4799000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	28000000	USD
CY2013Q3	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	874000	USD
CY2012	ttek	Business Acquisition Contingent Consideration Actual Cash Payment Reported As Cash Flows From Operating Activities BusinessAcquisitionContingentConsiderationActualCashPaymentReportedAsCashFlowsFromOperatingActivities	601000	USD
CY2011	ttek	Business Acquisition Contingent Consideration Actual Cash Payment Reported As Cash Flows From Investing Activities BusinessAcquisitionContingentConsiderationActualCashPaymentReportedAsCashFlowsFromInvestingActivities	22059000	USD
CY2012	ttek	Business Acquisition Contingent Consideration Actual Cash Payment Reported As Cash Flows From Investing Activities BusinessAcquisitionContingentConsiderationActualCashPaymentReportedAsCashFlowsFromInvestingActivities	11773000	USD
CY2012	ttek	Business Acquisition Settlement Of Receivables Due From Sellers BusinessAcquisitionSettlementOfReceivablesDueFromSellers	7301000	USD
CY2013	ttek	Estimated Earn Out Liabilities For Acquisitions During The Period EstimatedEarnOutLiabilitiesForAcquisitionsDuringThePeriod	75253000	USD
CY2013	ttek	Increase Decrease In Fair Value Of Contingent Consideration Reported In Interest Expense IncreaseDecreaseInFairValueOfContingentConsiderationReportedInInterestExpense	2433000	USD
CY2013	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	163022000	USD
CY2013Q2	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	56600000	USD
CY2013	ttek	Maximum Term Of Original Maturity To Classify An Instrument As Cash Equivalent MaximumTermOfOriginalMaturityToClassifyAnInstrumentAsCashEquivalent	P90D
CY2013	ttek	Unbilled Contracts Receivable Period For Billing And Collection UnbilledContractsReceivablePeriodForBillingAndCollection	P12M
CY2012	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	914000	USD
CY2012	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	48548000	USD
CY2013	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	56600000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	208171000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	121242000	USD
CY2012Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	167528000	USD
CY2012Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	93297000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	32400000	USD
CY2013	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	11646000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	40987000	USD
CY2013	ttek	Contract Termination Accrual Adjustment ContractTerminationAccrualAdjustment	-1466000	USD
CY2012Q4	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	658545000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	29600000	USD
CY2012Q3	ttek	Contract Termination Liability ContractTerminationLiability	2940000	USD
CY2013Q1	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	641999000	USD
CY2013Q2	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	614835000	USD
CY2013Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	698376000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	86929000	USD
CY2012Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	209427000	USD
CY2012Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	135118000	USD
CY2012Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	74309000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	242166000	USD
CY2013Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	154140000	USD
CY2013Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	88026000	USD
CY2013Q3	ttek	Contract Termination Liability ContractTerminationLiability	6273000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	19761000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	13580000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4376000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	141035000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	126912000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	160796000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	140492000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	46058000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	30246000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	6949000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5948000	USD
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	8569000	USD
CY2011	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	9596000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	61576000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	45790000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-200000	USD
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	6755000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-622000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1069000	USD
CY2012	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-4690000	USD
CY2011	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-6104000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-5512000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	1720000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	56064000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47510000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	60547000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-48015000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	12532000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	11155000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2705000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	25506000	USD
CY2013	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-2965000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-637000	USD
CY2013	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-7866000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-11468000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14038000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	56278000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	4932000	USD
CY2012	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	360000	USD
CY2012	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	774000	USD
CY2012	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-4444000	USD
CY2013	ttek	Income Tax Reconciliation Permanent Adjustments IncomeTaxReconciliationPermanentAdjustments	3255000	USD
CY2012	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	2512000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-608000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	49172000	USD
CY2011	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	1689000	USD
CY2011	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	770000	USD
CY2011	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-4140000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	260000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	4386000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	1316000	USD
CY2013	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	6622000	USD
CY2013	us-gaap	Income Tax Reconciliation Deductions Qualified Production Activities IncomeTaxReconciliationDeductionsQualifiedProductionActivities	828000	USD
CY2013	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-4263000	USD
CY2012	ttek	Effective Income Tax Rate Reconciliation Goodwill And Contingent Consideration EffectiveIncomeTaxRateReconciliationGoodwillAndContingentConsideration	-0.010	pure
CY2013	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	4947000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	116000	USD
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.002	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.005	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.028	pure
CY2013	ttek	Effective Income Tax Rate Reconciliation Permanent Adjustments EffectiveIncomeTaxRateReconciliationPermanentAdjustments	0.260	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.016	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.004	pure
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.349	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.031	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.012	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.006	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.030	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.003	pure
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.338	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.105	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.528	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.066	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.340	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.395	pure
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.009	pure
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	1.120	pure
CY2012Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	975000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	4689000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	2039000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	13298000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	10980000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	2926000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	2512000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	32395000	USD
CY2012Q3	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	45417000	USD
CY2012Q3	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	2251000	USD
CY2012Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	21695000	USD
CY2012Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	8109000	USD
CY2012Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	77472000	USD
CY2012Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-45077000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	452000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	5883000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	7345000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	14425000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	10778000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7459000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	19000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	47281000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2554000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	7522000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	24933000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	9946000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	89682000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-48695000	USD
CY2013Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	24100000	USD
CY2013	ttek	Unrecognized Tax Benefits Period To Affect Tax Rate UnrecognizedTaxBenefitsPeriodToAffectTaxRate	P12M
CY2013Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	25886000	USD
CY2012Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	24092000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21806000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	25940000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	6273000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8007000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	8072000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	6315000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	68000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	112000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	2661000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	4951000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	5818000	USD
CY2012Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	3100000	USD
CY2013Q3	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	2300000	USD
CY2013Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	207749000	USD
CY2013Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	4311000	USD
CY2013Q3	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	9563000	USD
CY2013Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	203438000	USD
CY2012Q3	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	83078000	USD
CY2012Q3	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	2031000	USD
CY2012Q3	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	81047000	USD
CY2013Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	161438000	USD
CY2012Q3	us-gaap	Capital Lease Obligations CapitalLeaseObligations	2800000	USD
CY2012Q3	us-gaap	Loans Payable Current LoansPayableCurrent	500000	USD
CY2013Q3	us-gaap	Capital Lease Obligations CapitalLeaseObligations	1800000	USD
CY2013Q3	us-gaap	Loans Payable Current LoansPayableCurrent	100000	USD
CY2013Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	4311000	USD
CY2013Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	10868000	USD
CY2013Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	15753000	USD
CY2013Q3	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	15379000	USD
CY2013Q3	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	23898000	USD
CY2013Q3	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	14771000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	90039000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	80800000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	76600000	USD
CY2011	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	71900000	USD
CY2013Q3	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	71293000	USD
CY2013Q3	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	54169000	USD
CY2013Q3	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	35265000	USD
CY2013Q3	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	24628000	USD
CY2013Q3	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	224024000	USD
CY2013Q3	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	648000	USD
CY2013Q3	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	384000	USD
CY2013Q3	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	5000	USD
CY2013Q3	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	1911000	USD
CY2013Q3	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	132000	USD
CY2013Q3	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	1779000	USD
CY2013	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	4500000	USD
CY2012	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	1300000	USD
CY2011	us-gaap	Impairment Of Leasehold ImpairmentOfLeasehold	1300000	USD
CY2013	ttek	Defined Benefit Plan Minimum Service Period For Eligibility DefinedBenefitPlanMinimumServicePeriodForEligibility	P1Y
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	14700000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	14100000	USD
CY2013	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	9500000	USD
CY2012Q3	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	13400000	USD
CY2012Q3	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	12900000	USD
CY2013Q3	us-gaap	Deferred Compensation Plan Assets DeferredCompensationPlanAssets	17200000	USD
CY2013Q3	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	16100000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	104380000	USD
CY2013	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-2141000	USD
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	64544000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63217000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	62053000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	717000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	722000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	63934000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	62775000	shares
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.65
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.45
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.63
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.43
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.03
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.03
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64544000	shares
CY2013	us-gaap	Line Of Credit Facility Increase Decrease For Period Net LineOfCreditFacilityIncreaseDecreaseForPeriodNet	205000000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4288000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3804000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3048000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	6551000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	6778000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5727000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10839000	USD
CY2013Q2	ttek	Increase Decrease In Operating Income Due To Project Charge IncreaseDecreaseInOperatingIncomeDueToProjectCharge	-35500000	USD
CY2013Q2	ttek	Number Of Programs For Which Project Charges Recorded NumberOfProgramsForWhichProjectChargesRecorded	4	item
CY2013	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3461000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2916000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	4877000	USD
CY2013Q3	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets VariableInterestEntityNonconsolidatedCarryingAmountAssets	24000000	USD
CY2012Q3	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Assets VariableInterestEntityNonconsolidatedCarryingAmountAssets	19000000	USD
CY2013Q3	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	21800000	USD
CY2012Q3	us-gaap	Variable Interest Entity Nonconsolidated Carrying Amount Liabilities VariableInterestEntityNonconsolidatedCarryingAmountLiabilities	15700000	USD
CY2013	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	2613755000	USD
CY2012	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	2711075000	USD
CY2011	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	2573144000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	20218000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	166367000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	146422000	USD
CY2013	us-gaap	Depreciation Depreciation	29548000	USD
CY2012	us-gaap	Depreciation Depreciation	26651000	USD
CY2013	ttek	Subcontractor Costs SubcontractorCosts	588923000	USD
CY2011	us-gaap	Depreciation Depreciation	27137000	USD
CY2013Q3	us-gaap	Assets Assets	1799092000	USD
CY2012Q3	us-gaap	Assets Assets	1671030000	USD
CY2013	ttek	Concentration Of Risk Revenue Percentage Minimum ConcentrationOfRiskRevenuePercentageMinimum	0.10	pure
CY2012Q1	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	682627000	USD
CY2012Q2	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	624345000	USD
CY2012Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	684698000	USD
CY2012Q3	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	719405000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	36093000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	35543000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	46261000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	48470000	USD
CY2012Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22610000	USD
CY2012Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	22284000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	29054000	USD
CY2012Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	30432000	USD
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.36
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.35
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.46
CY2011	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	8004000	USD
CY2012	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	17535000	USD
CY2013	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	14881000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5249000	USD
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5300000	USD
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.36
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.35
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.45
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.47
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	62433000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63072000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63387000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63623000	shares
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	63068000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	63817000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64179000	shares
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64396000	shares
CY2013	dei	Entity Registrant Name EntityRegistrantName	TETRA TECH INC
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0000831641
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q1	dei	Entity Public Float EntityPublicFloat	1900000000	USD
CY2013Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	64163177	shares
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-09-29
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-29
CY2011	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	1702000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	9000	USD
CY2013	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	445000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10582000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	10839000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	8775000	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	5551000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	-156000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	-72000	USD
CY2013	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	886000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	90494000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	220933000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10582000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	8775000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-28817000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	26815000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	19328000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	15875000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	13626000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	6333000	USD
CY2013Q3	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	4952000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	41809000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	37667000	USD
CY2012Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63864000	shares
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.21
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	-99884000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	40626000	USD
CY2012Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	26224000	USD
CY2013Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	24820000	USD
CY2013Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-78385000	USD
CY2013Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	25200000	USD
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.41
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.38
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.21
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.41
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.38
CY2013Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	64551000	shares
CY2013Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	64832000	shares
CY2013Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	64272000	shares
CY2012Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64608000	shares
CY2013Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	65472000	shares
CY2013Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64832000	shares
CY2013Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	64853000	shares
CY2012	ttek	Loss On Government Contract Receivable Unbilled Amounts Related To Claims And Requests For Equitable Adjustment LossOnGovernmentContractReceivableUnbilledAmountsRelatedToClaimsAndRequestsForEquitableAdjustment	0	USD
CY2011Q4	us-gaap	Goodwill Goodwill	569414000	USD
CY2013Q3	us-gaap	Goodwill Goodwill	722792000	USD
CY2013Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	129305000	USD
CY2013Q3	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	61446000	USD
CY2013Q3	us-gaap	Assets Current AssetsCurrent	871642000	USD
CY2013Q3	us-gaap	Equity Method Investments EquityMethodInvestments	2198000	USD
CY2013Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	86929000	USD
CY2013Q3	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	27505000	USD
CY2013Q3	us-gaap	Accounts Payable Current AccountsPayableCurrent	142813000	USD
CY2013Q3	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	114810000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Current DeferredTaxLiabilitiesCurrent	18170000	USD
CY2013Q3	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	100241000	USD
CY2013Q3	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	30525000	USD
CY2013Q3	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	24685000	USD
CY2013Q3	us-gaap	Common Stock Value CommonStockValue	641000	USD
CY2013Q3	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	443099000	USD
CY2013Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	1858000	USD
CY2013Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	552165000	USD
CY2013Q3	us-gaap	Minority Interest MinorityInterest	1040000	USD
CY2013	us-gaap	Other Cost Of Operating Revenue OtherCostOfOperatingRevenue	1757842000	USD
CY2013	ttek	Selling General And Administrative Expenses Including Depreciation And Amortization Of Intangible Assets SellingGeneralAndAdministrativeExpensesIncludingDepreciationAndAmortizationOfIntangibleAssets	199732000	USD
CY2013	ttek	Fair Value Adjustments To Contingent Consideration FairValueAdjustmentsToContingentConsideration	9560000	USD
CY2013	us-gaap	Investment Income Interest InvestmentIncomeInterest	1003000	USD
CY2013	us-gaap	Interest Expense InterestExpense	8689000	USD
CY2013	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	635000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	62605000	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	588000	USD
CY2013	us-gaap	Foreign Currency Transaction Gain Loss Realized ForeignCurrencyTransactionGainLossRealized	-270000	USD
CY2013	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	4458000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	8775000	USD
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Operating Activities ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	886000	USD
CY2013	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	13818000	USD
CY2013	ttek	Lease Termination Costs And Related Asset Impairment Charges LeaseTerminationCostsAndRelatedAssetImpairmentCharges	7188000	USD
CY2013	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	287000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-87367000	USD
CY2013	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	11782000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-34191000	USD
CY2013	ttek	Increase Decrease In Accrued Compensation IncreaseDecreaseInAccruedCompensation	-16385000	USD
CY2013	us-gaap	Increase Decrease In Billing In Excess Of Cost Of Earnings IncreaseDecreaseInBillingInExcessOfCostOfEarnings	-16830000	USD
CY2013	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-19218000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	27545000	USD
CY2013	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	171329000	USD
CY2013	us-gaap	Payments For Hedge Investing Activities PaymentsForHedgeInvestingActivities	4177000	USD
CY2013	us-gaap	Proceeds From Hedge Investing Activities ProceedsFromHedgeInvestingActivities	3907000	USD
CY2013	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-470000	USD
CY2013	us-gaap	Payments To Acquire Interest In Joint Venture PaymentsToAcquireInterestInJointVenture	20000	USD
CY2013	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	2089000	USD
CY2013	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	171400000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt And Capital Securities Net ProceedsFromIssuanceOfLongTermDebtAndCapitalSecuritiesNet	296389000	USD
CY2013	ttek	Payments Of Earn Out Liabilities PaymentsOfEarnOutLiabilities	33672000	USD
CY2013	ttek	Payments Of Debt Issuance Costs1 PaymentsOfDebtIssuanceCosts1	2136000	USD
CY2013	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	445000	USD
CY2013	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	886000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	20000000	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	15993000	USD
CY2013	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents Continuing Operations EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations	-2303000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	5049000	USD
CY2012	ttek	Income Tax Reconciliation Goodwill And Contingent Consideration IncomeTaxReconciliationGoodwillAndContingentConsideration	-1552000	USD
CY2013	ttek	Income Tax Reconciliation Goodwill And Contingent Consideration IncomeTaxReconciliationGoodwillAndContingentConsideration	11288000	USD
CY2013	ttek	Effective Income Tax Rate Reconciliation Goodwill And Contingent Consideration EffectiveIncomeTaxRateReconciliationGoodwillAndContingentConsideration	0.900	pure
CY2012	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	18910000	USD
CY2013	us-gaap	Goodwill Translation Adjustments GoodwillTranslationAdjustments	-19588000	USD
CY2013	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	20000000	USD
CY2013Q2	ttek	Increase Decrease In Operating Income Due To Charges Related To Mining Operations IncreaseDecreaseInOperatingIncomeDueToChargesRelatedToMiningOperations	-28200000	USD
CY2013Q3	us-gaap	Business Acquisition Contingent Consideration At Fair Value BusinessAcquisitionContingentConsiderationAtFairValue	81800000	USD
CY2013Q3	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	23500000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	443000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	80000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Share Based Compensation Cost IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	301000	USD
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.035	pure
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.001	pure
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.002	pure

Files In Submission

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$TTEK
TETRA TECH INC Stock $ttek

2013 Q3 Form 10-K Financial Statement

#000104746913010692 Filed on November 20, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TTEK TETRA TECH INC Stock $ttek

2013 Q3 Form 10-K Financial Statement

#000104746913010692 Filed on November 20, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$TTEK
TETRA TECH INC Stock $ttek