$BLKB
BLACKBAUD INC Stock $blkb

$blkb Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000128005821000006 Filed on February 23, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$242.6M	$215.0M	$232.0M
YoY Change	2.0%	-2.77%	2.82%
Cost Of Revenue	$119.6M	$98.69M	$104.9M
YoY Change	2.66%	-3.06%	4.1%
Gross Profit	$123.0M	$116.3M	$127.1M
YoY Change	1.42%	-2.52%	1.78%
Gross Profit Margin	50.71%	54.1%	54.77%
Selling, General & Admin	$94.50M	$82.59M	$81.80M
YoY Change	8.62%	-2.14%	-2.1%
% of Gross Profit	76.81%	71.01%	64.38%
Research & Development	$27.50M	$22.78M	$24.90M
YoY Change	6.18%	-12.17%	-3.89%
% of Gross Profit	22.35%	19.59%	19.59%
Depreciation & Amortization	$23.90M	$5.100M	$24.30M
YoY Change	10.14%	34.21%	13.55%
% of Gross Profit	19.43%	4.38%	19.13%
Operating Expenses	$122.7M	$106.2M	$107.5M
YoY Change	6.6%	-4.68%	-3.47%
Operating Profit	-$850.0K	$10.09M	$19.58M
YoY Change	-123.7%	27.96%	45.15%
Interest Expense	-$5.000M	$3.997M	$3.893M
YoY Change	13.64%	-21.8%	-32.87%
% of Operating Profit		39.63%	19.88%
Other Income/Expense, Net	-$800.0K	-$225.0K	$520.0K
YoY Change	60.0%	-124.7%	-68.6%
Pretax Income	-$6.672M	$6.632M	$16.32M
YoY Change	428.68%	34.52%	65.29%
Income Tax	$6.900M	$1.756M	$4.496M
% Of Pretax Income		26.48%	27.55%
Net Earnings	-$13.62M	$4.876M	$11.82M
YoY Change	-1128.78%	6.79%	65.59%
Net Earnings / Revenue	-5.61%	2.27%	5.1%
Basic Earnings Per Share	-$0.28	$0.10	$0.25
Diluted Earnings Per Share	-$0.28	$0.10	$0.24
COMMON SHARES
Basic Shares Outstanding	49.57M shares	48.27M shares	48.24M shares
Diluted Shares Outstanding		48.86M shares	48.42M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$36.50M	$31.40M	$31.40M
YoY Change	11.62%	4.67%	-6.55%
Cash & Equivalents	$35.75M	$30.56M	$30.53M
Short-Term Investments	$800.0K	$800.0K	$900.0K
Other Short-Term Assets	$674.5M	$269.1M	$495.3M
YoY Change	11.41%	-13.03%	17.76%
Inventory
Prepaid Expenses
Receivables	$95.40M	$96.83M	$129.7M
Other Receivables	$2.200M	$5.800M	$2.100M
Total Short-Term Assets	$819.1M	$412.7M	$667.1M
YoY Change	11.51%	-7.45%	11.16%
LONG-TERM ASSETS
Property, Plant & Equipment	$105.2M	$109.5M	$36.54M
YoY Change	195.89%	193.6%	-7.66%
Goodwill	$635.9M	$632.8M	$630.7M
YoY Change	0.28%	0.35%	-0.25%
Intangibles	$277.5M	$284.4M	$292.2M
YoY Change	-12.71%	-13.05%	-14.22%
Long-Term Investments
YoY Change
Other Assets	$72.64M	$72.62M	$68.67M
YoY Change	11.42%	13.19%	3.55%
Total Long-Term Assets	$1.226B	$1.238B	$1.230B
YoY Change	-2.6%	-2.03%	-3.46%
TOTAL ASSETS
Total Short-Term Assets	$819.1M	$412.7M	$667.1M
Total Long-Term Assets	$1.226B	$1.238B	$1.230B
Total Assets	$2.045B	$1.651B	$1.897B
YoY Change	2.6%	-3.44%	1.22%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$27.80M	$31.80M	$41.00M
YoY Change	-41.72%	-7.02%	14.85%
Accrued Expenses	$26.80M	$29.10M	$29.40M
YoY Change	-52.14%	-45.81%	-41.2%
Deferred Revenue	$312.2M	$322.5M	$332.6M
YoY Change	-0.67%	0.46%	1.61%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$12.84M	$10.31M	$9.194M
YoY Change	71.2%	37.4%	22.59%
Total Short-Term Liabilities	$1.013B	$620.3M	$858.9M
YoY Change	2.48%	-8.44%	8.64%
LONG-TERM LIABILITIES
Long-Term Debt	$518.2M	$498.0M	$478.9M
YoY Change	12.75%	0.48%	-13.52%
Other Long-Term Liabilities	$10.87M	$12.61M	$11.88M
YoY Change	89.24%	104.14%	104.81%
Total Long-Term Liabilities	$529.1M	$510.6M	$490.8M
YoY Change	13.69%	1.76%	-12.3%
TOTAL LIABILITIES
Total Short-Term Liabilities	$1.013B	$620.3M	$858.9M
Total Long-Term Liabilities	$529.1M	$510.6M	$490.8M
Total Liabilities	$1.619B	$1.209B	$1.486B
YoY Change	1.4%	-8.97%	-1.02%
SHAREHOLDERS EQUITY
Retained Earnings	$236.7M	$250.3M	$245.4M
YoY Change	0.79%	4.56%	1.95%
Common Stock	$545.0M	$512.3M	$491.5M
YoY Change	19.04%	15.69%	14.84%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$353.1M	$312.0M	$311.7M
YoY Change	21.48%	8.63%	8.73%
Treasury Stock Shares	12.05M shares	11.34M shares	11.33M shares
Shareholders Equity	$426.2M	$441.8M	$410.8M
YoY Change
Total Liabilities & Shareholders Equity	$2.045B	$1.651B	$1.897B
YoY Change	2.6%	-3.44%	1.22%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	-$13.62M	$4.876M	$11.82M
YoY Change	-1128.78%	6.79%	65.59%
Depreciation, Depletion And Amortization	$23.90M	$5.100M	$24.30M
YoY Change	10.14%	34.21%	13.55%
Cash From Operating Activities	$38.80M	$71.70M	$62.00M
YoY Change	-35.76%	-6.88%	12.52%
INVESTING ACTIVITIES
Capital Expenditures	-$13.90M	-$30.30M	-$13.80M
YoY Change	-2.8%	108.97%	-19.3%
Acquisitions
YoY Change
Other Investing Activities	$0.00	$0.00	$0.00
YoY Change			-100.0%
Cash From Investing Activities	-$13.90M	-$30.30M	-$13.80M
YoY Change	-2.11%	108.97%	-16.87%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	383.1M	-261.3M	146.4M
YoY Change	49.77%	48.97%	39.16%
NET CHANGE
Cash From Operating Activities	38.80M	71.70M	62.00M
Cash From Investing Activities	-13.90M	-30.30M	-13.80M
Cash From Financing Activities	383.1M	-261.3M	146.4M
Net Change In Cash	408.0M	-219.9M	194.6M
YoY Change	35.1%	94.77%	35.42%
FREE CASH FLOW
Cash From Operating Activities	$38.80M	$71.70M	$62.00M
Capital Expenditures	-$13.90M	-$30.30M	-$13.80M
Free Cash Flow	$52.70M	$102.0M	$75.80M
YoY Change	-29.45%	11.48%	4.99%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001280058
CY2019Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	blkb:AccruedExpensesAndOtherCurrentLiabilities
CY2020Q4	us-gaap	Operating Lease Liability Current Statement Of Financial Position Extensible List OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	blkb:AccruedExpensesAndOtherCurrentLiabilities
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Entity File Number EntityFileNumber	000-50600
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity Registrant Name EntityRegistrantName	Blackbaud, Inc.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	11-2617163
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	65 Fairchild Street
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Charleston
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	SC
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	29492
CY2020	dei	City Area Code CityAreaCode	843
CY2020	dei	Local Phone Number LocalPhoneNumber	216-6200
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.001 Par Value
CY2020	dei	Trading Symbol TradingSymbol	BLKB
CY2020	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	2458658098	USD
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	48381440	shares
CY2020	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	714000	shares
CY2020Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	250000000.0	USD
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CY2020Q1	blkb	Annual Dividendper Share Approved AnnualDividendperShareApproved	0.48
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	35750000	USD
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CY2020Q4	us-gaap	Other Restricted Assets Current OtherRestrictedAssetsCurrent	321000	USD
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CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	59417000	USD
CY2020	us-gaap	Interest Expense InterestExpense	17287000	USD
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CY2019	blkb	Nonoperating Income Expense Excluding Interest Expense NonoperatingIncomeExpenseExcludingInterestExpense	4058000	USD
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CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
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CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48696341	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48312271	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48045084	shares
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	4571000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	2641000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-5218000	USD
CY2020	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-1778000	USD
CY2019	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	-2821000	USD
CY2018	us-gaap	Other Comprehensive Income Derivatives Qualifying As Hedges Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent	583000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	2793000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-180000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-4635000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	10510000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	11728000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	40206000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7717000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	11908000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	44841000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	92735000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	85693000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	79566000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	13230000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	8725000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	6890000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	87257000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	58633000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	48274000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8837000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3600000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-619000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	781000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	752000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	752000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-2958000	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-4906000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	1912000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	18414000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	6569000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-2166000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-22568000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-6383000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	5217000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-19997000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	12900000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	9487000	USD
CY2020	blkb	Increase Decrease Accrued Expenses And Other Liabilities IncreaseDecreaseAccruedExpensesAndOtherLiabilities	-49232000	USD
CY2019	blkb	Increase Decrease Accrued Expenses And Other Liabilities IncreaseDecreaseAccruedExpensesAndOtherLiabilities	-9718000	USD
CY2018	blkb	Increase Decrease Accrued Expenses And Other Liabilities IncreaseDecreaseAccruedExpensesAndOtherLiabilities	-2027000	USD
CY2020	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	-485000	USD
CY2019	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	12464000	USD
CY2018	us-gaap	Increase Decrease In Deferred Revenue IncreaseDecreaseInDeferredRevenue	19184000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	147955000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	182477000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	201385000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	29690000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	11492000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	14719000	USD
CY2020	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	42157000	USD
CY2019	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	46874000	USD
CY2018	us-gaap	Payments To Develop Software PaymentsToDevelopSoftware	37629000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	109353000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	44943000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	0	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-500000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	500000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-71847000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-167219000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-97791000	USD
CY2020	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	748500000	USD
CY2019	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	424000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Debt ProceedsFromIssuanceOfDebt	270900000	USD
CY2020	us-gaap	Repayments Of Debt RepaymentsOfDebt	747563000	USD
CY2019	us-gaap	Repayments Of Debt RepaymentsOfDebt	344500000	USD
CY2018	us-gaap	Repayments Of Debt RepaymentsOfDebt	322476000	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4586000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	0	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	21425000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	23781000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	27685000	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	4000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	7000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	11000	USD
CY2020	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	61214000	USD
CY2019	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	77793000	USD
CY2018	us-gaap	Proceeds From Repayments Of Restricted Cash Financing Activities ProceedsFromRepaymentsOfRestrictedCashFinancingActivities	-188502000	USD
CY2020	blkb	Change In Customer Funds Receivable ChangeInCustomerFundsReceivable	138000	USD
CY2019	blkb	Change In Customer Funds Receivable ChangeInCustomerFundsReceivable	1301000	USD
CY2018	blkb	Change In Customer Funds Receivable ChangeInCustomerFundsReceivable	-844000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	41001000	USD
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	48274000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	5960000	USD
CY2019	us-gaap	Payments Of Dividends PaymentsOfDividends	23607000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	23312000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-10679000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	111213000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-291908000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	2245000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	978000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	-2014000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	67674000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	127449000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-190328000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	577295000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	449846000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	640174000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	644969000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	577295000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	449846000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	15716000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	19926000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	15261000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3563000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	383000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	-7138000	USD
CY2020	us-gaap	Loans Assumed1 LoansAssumed1	61064000	USD
CY2019	us-gaap	Loans Assumed1 LoansAssumed1	0	USD
CY2018	us-gaap	Loans Assumed1 LoansAssumed1	0	USD
CY2020	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	840000	USD
CY2019	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	794000	USD
CY2018	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	882000	USD
CY2020	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0	USD
CY2019	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	46838000	USD
CY2018	us-gaap	Liabilities Assumed1 LiabilitiesAssumed1	0	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	35750000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	31810000	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	609219000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	545485000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	644969000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	577295000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	336289000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	44841000	USD
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2018	us-gaap	Dividends Cash DividendsCash	23312000	USD
CY2018	blkb	Exercise Of Stock Options And Stock Appreciation Rights Value ExerciseOfStockOptionsAndStockAppreciationRightsValue	11000	USD
CY2018	blkb	Surrender Of Shares Upon Restricted Stock And Restricted Unit Vesting And Exerciseof Stock Appreciation Rights SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights	284780	shares
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	27685000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-4635000	USD
CY2018	blkb	Stockholders Equity Asu201802 Adoption StockholdersEquityASU201802Adoption	0	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	373783000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	11908000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2019	us-gaap	Dividends Cash DividendsCash	23607000	USD
CY2019	blkb	Exercise Of Stock Options And Stock Appreciation Rights Value ExerciseOfStockOptionsAndStockAppreciationRightsValue	7000	USD
CY2019	blkb	Surrender Of Shares Upon Restricted Stock And Restricted Unit Vesting And Exerciseof Stock Appreciation Rights SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights	305780	shares
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	23781000	USD
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	58633000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	1000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-180000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	396764000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7717000	USD
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2020	us-gaap	Dividends Cash DividendsCash	5960000	USD
CY2020	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	714000	shares
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	41001000	USD
CY2020	blkb	Exercise Of Stock Options And Stock Appreciation Rights Value ExerciseOfStockOptionsAndStockAppreciationRightsValue	4000	USD
CY2020	blkb	Surrender Of Shares Upon Restricted Stock And Restricted Unit Vesting And Exerciseof Stock Appreciation Rights SurrenderOfSharesUponRestrictedStockAndRestrictedUnitVestingAndExerciseofStockAppreciationRights	273914	shares
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	21425000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	87257000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Gross StockIssuedDuringPeriodValueRestrictedStockAwardGross	1000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	2793000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	426150000	USD
CY2020Q4	blkb	Active Customers ActiveCustomers	45000	Customers
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:15pt;text-align:justify"><span style="color:#000000;font-family:'Frutiger LT 45 Light',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of estimates</span></div><div style="margin-top:9pt;text-align:justify"><span style="color:#000000;font-family:'Frutiger LT 45 Light',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. On an ongoing basis, we reconsider and evaluate our estimates and assumptions, including those that impact revenue recognition, long-lived and intangible assets, income taxes, business combinations, stock-based compensation, capitalization of software development costs, our allowances for credit losses and sales returns, costs of obtaining contracts, valuation of derivative instruments and loss contingencies, among others. Changes in the facts or circumstances underlying these estimates, including due to COVID-19, could result in material changes and actual results could materially differ from these estimates.</span></div>
CY2020Q1	blkb	Annual Dividendper Share Approved AnnualDividendperShareApproved	0.48
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06
CY2020	blkb	One Time Cash Outlay Related To Real Estate Activities OneTimeCashOutlayRelatedToRealEstateActivities	21900000	USD
CY2020	blkb	Pre Tax Costs Related To Real Estate Activities PreTaxCostsRelatedToRealEstateActivities	23100000	USD
CY2020	blkb	Future Annual Before Tax Savings Related To Real Estate Activities FutureAnnualBeforeTaxSavingsRelatedToRealEstateActivities	14000000.0	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	121600000	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	113400000	USD
CY2020	blkb	Contract Term Of Recurring Revenue Contracts At Contract Inception Years ContractTermOfRecurringRevenueContractsAtContractInceptionYears	P3Y
CY2020Q4	us-gaap	Capitalized Contract Cost Amortization Period CapitalizedContractCostAmortizationPeriod	P5Y
CY2020	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="margin-top:15pt;text-align:justify"><span style="color:#000000;font-family:'Frutiger LT 45 Light',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Concentration of credit risk</span></div><div style="margin-top:9pt;text-align:justify"><span style="color:#000000;font-family:'Frutiger LT 45 Light',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Financial instruments that potentially subject us to concentrations of credit risk consist of cash and cash equivalents, restricted cash due to customers and accounts receivable. Our cash and cash equivalents and restricted cash due to customers are placed with high credit-quality financial institutions. Our accounts receivable is derived from sales to customers who primarily operate in the nonprofit sector. With respect to accounts receivable, we perform ongoing evaluations of our customers and maintain an allowance for credit losses based on historical experience and our </span></div>expectations of future credit losses.
CY2019Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	0	USD
CY2018Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	0	USD
CY2020Q4	us-gaap	Real Estate Inventory Capitalized Interest Costs RealEstateInventoryCapitalizedInterestCosts	0	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2020	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0	USD
CY2018	us-gaap	Impairment Of Long Lived Assets To Be Disposed Of ImpairmentOfLongLivedAssetsToBeDisposedOf	0	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1100000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	900000	USD
CY2020	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2019	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2018	us-gaap	Other Asset Impairment Charges OtherAssetImpairmentCharges	0	USD
CY2020Q1	blkb	Amount Reclassified Upon Adoption Of Asu201613 AmountReclassifiedUponAdoptionOfASU201613	2100000	USD
CY2020Q1	blkb	Amount Reclassified Upon Adoption Of Asu201613 AmountReclassifiedUponAdoptionOfASU201613	2100000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	3000000.0	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	3100000	USD
CY2018	us-gaap	Advertising Expense AdvertisingExpense	4000000.0	USD
CY2020Q4	us-gaap	Goodwill Goodwill	635854000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	634088000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	1766000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	554097000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	556491000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-276591000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-238596000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	277506000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	317895000	USD
CY2019	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	900000	USD
CY2020	us-gaap	Adjustment For Amortization AdjustmentForAmortization	41883000	USD
CY2019	us-gaap	Adjustment For Amortization AdjustmentForAmortization	50085000	USD
CY2018	us-gaap	Adjustment For Amortization AdjustmentForAmortization	47077000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	36933000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	34739000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	33735000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	33222000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	30482000	USD
CY2020Q4	blkb	Estimated Amortization Expensefor Finite Lived Intangible Assetsforthe Next Five Years EstimatedAmortizationExpenseforFiniteLivedIntangibleAssetsfortheNextFiveYears	169111000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	7717000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	11908000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	44841000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48184714	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47695383	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	47206669	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	511627	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	616888	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	838415	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48696341	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48312271	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	48045084	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.95
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.25
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.93
CY2020	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	956303	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	241336	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	48881	shares
CY2020	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	4300000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	4000000.0	USD
CY2019	blkb	Restructuring Reserve Period Increase Decrease Relatedto Impairmentof Operating Lease Rightof Use Assets RestructuringReservePeriodIncreaseDecreaseRelatedtoImpairmentofOperatingLeaseRightofUseAssets	3800000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	1400000	USD
CY2019	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	900000	USD
CY2020Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	75225000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	175232000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	139614000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	70055000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	104068000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	105177000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	35546000	USD
CY2020Q4	blkb	Amount Reclassified From Leasehold Improvements To Building Improvements AmountReclassifiedFromLeaseholdImprovementsToBuildingImprovements	5500000	USD
CY2020	us-gaap	Depreciation Depreciation	19200000	USD
CY2019	us-gaap	Depreciation Depreciation	15000000.0	USD
CY2018	us-gaap	Depreciation Depreciation	15900000	USD
CY2019	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	1400000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	164665000	USD
CY2019Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	139014000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	52838000	USD
CY2019Q4	us-gaap	Capitalized Computer Software Accumulated Amortization CapitalizedComputerSoftwareAccumulatedAmortization	37712000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	111827000	USD
CY2019Q4	us-gaap	Capitalized Computer Software Net CapitalizedComputerSoftwareNet	101302000	USD
CY2020	us-gaap	Capitalized Computer Software Impairments1 CapitalizedComputerSoftwareImpairments1	4300000	USD
CY2020	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	31700000	USD
CY2019	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	20700000	USD
CY2018	us-gaap	Capitalized Computer Software Amortization1 CapitalizedComputerSoftwareAmortization1	16600000	USD
CY2020Q4	us-gaap	Restricted Cash RestrictedCash	607943000	USD
CY2019Q4	us-gaap	Restricted Cash RestrictedCash	545485000	USD
CY2020Q4	us-gaap	Escrow Deposit EscrowDeposit	1276000	USD
CY2019Q4	us-gaap	Escrow Deposit EscrowDeposit	0	USD
CY2020Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	609219000	USD
CY2019Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	545485000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	84914000	USD
CY2019Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	90764000	USD
CY2020Q4	blkb	Prepaid Software Maintenance Current And Long Term PrepaidSoftwareMaintenanceCurrentAndLongTerm	24471000	USD
CY2019Q4	blkb	Prepaid Software Maintenance Current And Long Term PrepaidSoftwareMaintenanceCurrentAndLongTerm	17384000	USD
CY2020Q4	us-gaap	Hosting Arrangement Service Contract Implementation Cost Capitalized After Accumulated Amortization HostingArrangementServiceContractImplementationCostCapitalizedAfterAccumulatedAmortization	11298000	USD
CY2019Q4	us-gaap	Hosting Arrangement Service Contract Implementation Cost Capitalized After Accumulated Amortization HostingArrangementServiceContractImplementationCostCapitalizedAfterAccumulatedAmortization	7294000	USD
CY2020Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	10385000	USD
CY2019Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	6233000	USD
CY2020Q4	us-gaap	Estimated Insurance Recoveries EstimatedInsuranceRecoveries	6288000	USD
CY2019Q4	us-gaap	Estimated Insurance Recoveries EstimatedInsuranceRecoveries	0	USD
CY2020Q4	blkb	Prepaid Insurance Currentand Longterm PrepaidInsuranceCurrentandLongterm	1426000	USD
CY2019Q4	blkb	Prepaid Insurance Currentand Longterm PrepaidInsuranceCurrentandLongterm	1585000	USD
CY2020Q4	blkb	Taxes Prepaid And Receivable Current And Long Term TaxesPrepaidAndReceivableCurrentAndLongTerm	1891000	USD
CY2019Q4	blkb	Taxes Prepaid And Receivable Current And Long Term TaxesPrepaidAndReceivableCurrentAndLongTerm	849000	USD
CY2020Q4	us-gaap	Security Deposit SecurityDeposit	754000	USD
CY2019Q4	us-gaap	Security Deposit SecurityDeposit	885000	USD
CY2020Q4	us-gaap	Other Assets OtherAssets	9578000	USD
CY2019Q4	us-gaap	Other Assets OtherAssets	8051000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	151005000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	133045000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	72639000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	65193000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	78366000	USD
CY2019Q4	us-gaap	Prepaid Expense And Other Assets Current PrepaidExpenseAndOtherAssetsCurrent	67852000	USD
CY2020	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	37400000	USD
CY2019	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	38100000	USD
CY2018	us-gaap	Capitalized Contract Cost Amortization CapitalizedContractCostAmortization	35700000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net Current CapitalizedContractCostNetCurrent	31900000	USD
CY2019Q4	us-gaap	Capitalized Contract Cost Net Current CapitalizedContractCostNetCurrent	33000000.0	USD
CY2020Q4	blkb	Prepaid Software Maintenance And Subscriptions Current PrepaidSoftwareMaintenanceAndSubscriptionsCurrent	19800000	USD
CY2019Q4	blkb	Prepaid Software Maintenance And Subscriptions Current PrepaidSoftwareMaintenanceAndSubscriptionsCurrent	16100000	USD
CY2020	us-gaap	Hosting Arrangement Service Contract Implementation Cost Expense Amortization HostingArrangementServiceContractImplementationCostExpenseAmortization	800000	USD
CY2020Q4	us-gaap	Hosting Arrangement Service Contract Implementation Cost Capitalized Accumulated Amortization HostingArrangementServiceContractImplementationCostCapitalizedAccumulatedAmortization	1100000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	9359000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	19784000	USD
CY2020Q4	us-gaap	Accrued Bonuses Current And Noncurrent AccruedBonusesCurrentAndNoncurrent	0	USD
CY2019Q4	us-gaap	Accrued Bonuses Current And Noncurrent AccruedBonusesCurrentAndNoncurrent	24617000	USD
CY2020Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	19577000	USD
CY2019Q4	us-gaap	Taxes Payable Current And Noncurrent TaxesPayableCurrentAndNoncurrent	6835000	USD
CY2020Q4	blkb	Accrued Customer Credit Balances Current And Long Term AccruedCustomerCreditBalancesCurrentAndLongTerm	5874000	USD
CY2019Q4	blkb	Accrued Customer Credit Balances Current And Long Term AccruedCustomerCreditBalancesCurrentAndLongTerm	4505000	USD
CY2020Q4	blkb	Accrued Commissions And Salaries Current And Long Term AccruedCommissionsAndSalariesCurrentAndLongTerm	5010000	USD
CY2019Q4	blkb	Accrued Commissions And Salaries Current And Long Term AccruedCommissionsAndSalariesCurrentAndLongTerm	6980000	USD
CY2020Q4	us-gaap	Accrued Professional Fees Current And Noncurrent AccruedProfessionalFeesCurrentAndNoncurrent	4808000	USD
CY2019Q4	us-gaap	Accrued Professional Fees Current And Noncurrent AccruedProfessionalFeesCurrentAndNoncurrent	87000	USD
CY2020Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	4159000	USD
CY2019Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	1757000	USD
CY2020Q4	blkb	Unrecognized Tax Benefit Currentand Longterm UnrecognizedTaxBenefitCurrentandLongterm	3351000	USD
CY2019Q4	blkb	Unrecognized Tax Benefit Currentand Longterm UnrecognizedTaxBenefitCurrentandLongterm	3758000	USD
CY2020Q4	us-gaap	Accrued Insurance Current And Noncurrent AccruedInsuranceCurrentAndNoncurrent	2341000	USD
CY2019Q4	us-gaap	Accrued Insurance Current And Noncurrent AccruedInsuranceCurrentAndNoncurrent	2399000	USD
CY2020Q4	us-gaap	Accrued Vacation Current And Noncurrent AccruedVacationCurrentAndNoncurrent	2311000	USD
CY2019Q4	us-gaap	Accrued Vacation Current And Noncurrent AccruedVacationCurrentAndNoncurrent	2232000	USD
CY2020Q4	us-gaap	Other Liabilities OtherLiabilities	6304000	USD
CY2019Q4	us-gaap	Other Liabilities OtherLiabilities	6105000	USD
CY2020Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	63094000	USD
CY2019Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	79059000	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	10866000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	5742000	USD
CY2020Q4	blkb	Accrued Expenses And Other Current Liabilities AccruedExpensesAndOtherCurrentLiabilities	52228000	USD
CY2019Q4	blkb	Accrued Expenses And Other Current Liabilities AccruedExpensesAndOtherCurrentLiabilities	73317000	USD
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	316914000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	316137000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	4678000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Noncurrent ContractWithCustomerLiabilityNoncurrent	1802000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	312236000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	314335000	USD
CY2020	us-gaap	Investment Income Interest InvestmentIncomeInterest	1660000	USD
CY2019	us-gaap	Investment Income Interest InvestmentIncomeInterest	2802000	USD
CY2018	us-gaap	Investment Income Interest InvestmentIncomeInterest	2008000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-2000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1256000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-905000	USD
CY2020	blkb	Nonoperating Income Expense Excluding Interest Expense NonoperatingIncomeExpenseExcludingInterestExpense	1658000	USD
CY2019	blkb	Nonoperating Income Expense Excluding Interest Expense NonoperatingIncomeExpenseExcludingInterestExpense	4058000	USD
CY2018	blkb	Nonoperating Income Expense Excluding Interest Expense NonoperatingIncomeExpenseExcludingInterestExpense	1103000	USD
CY2020Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	3926000	USD
CY2019Q4	us-gaap	Other Long Term Debt OtherLongTermDebt	0	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	534177000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	468250000	USD
CY2020Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.0321
CY2019Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.0318
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-3144000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-1150000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	12840000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7500000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	518193000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	459600000	USD
CY2018	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
CY2020	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
CY2017Q2	us-gaap	Debt Instrument Term DebtInstrumentTerm	P5Y
CY2017Q2	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	700000000.0	USD
CY2020Q4	us-gaap	Debt Instrument Term DebtInstrumentTerm	P5Y
CY2020Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	900000000.0	USD
CY2020Q4	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4000000.0	USD
CY2020Q4	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1200000	USD
CY2020Q4	us-gaap	Debt Issuance Costs Line Of Credit Arrangements Net DebtIssuanceCostsLineOfCreditArrangementsNet	1500000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	-2000000.0	USD
CY2020	us-gaap	Line Of Credit Facility Unused Capacity Commitment Fee Percentage LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage	0.0025
CY2020Q4	blkb	Lineof Credit Facility Available Increase Capacity Amount LineofCreditFacilityAvailableIncreaseCapacityAmount	250000000.0	USD
CY2020Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	429300000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	12840000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	12985000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	11983000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	11609000	USD
CY2020	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	431408000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	53352000	USD
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	534177000	USD
CY2020Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	395000000	USD
CY2020	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	3400000	USD
CY2019	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	22200000	USD
CY2018	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	0	USD
CY2019	us-gaap	Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet	0	USD
CY2020	blkb	Operating Lease Lease Not Yet Commenced Expense OperatingLeaseLeaseNotYetCommencedExpense	3500000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	41210000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	27519000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	4266000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	4035000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	3120000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	3189000	USD
CY2020	us-gaap	Lease Cost LeaseCost	42356000	USD
CY2019	us-gaap	Lease Cost LeaseCost	28365000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	4000000.0	USD
CY2019	blkb	Restructuring Reserve Period Increase Decrease Relatedto Impairmentof Operating Lease Rightof Use Assets RestructuringReservePeriodIncreaseDecreaseRelatedtoImpairmentofOperatingLeaseRightofUseAssets	3800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	10353000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5796000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4417000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	3211000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	1905000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	3847000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	29529000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	2813000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	26716000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	22671000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	104400000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	26716000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	115408000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y7M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y6M
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0570
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0596
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	25120000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	24569000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	11002000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	102245000	USD
CY2020	blkb	Security Incident Expense SecurityIncidentExpense	10400000	USD
CY2020	blkb	Security Incident Accrued Insurance Recoveries SecurityIncidentAccruedInsuranceRecoveries	9400000	USD
CY2020	us-gaap	Insurance Recoveries InsuranceRecoveries	3100000	USD
CY2020	blkb	Security Incident Number Of Customer Claims SecurityIncidentNumberOfCustomerClaims	570	cases
CY2020	blkb	Security Incident Number Of Consumer Class Action Cases SecurityIncidentNumberOfConsumerClassActionCases	30	cases
CY2020	blkb	Security Incident Number Of State Attorneys General SecurityIncidentNumberOfStateAttorneysGeneral	44	cases
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-407000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	1534000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-1088000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1563000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	613000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	1182000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	3904000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	130000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	306000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	5060000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2277000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	400000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1064000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1724000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	659000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	7725000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2235000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	45000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	2176000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	359000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1323000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8837000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-3600000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-619000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	13897000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1323000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-219000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-4112000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	5149000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	47532000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	25726000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	5436000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-2910000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	21614000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	10585000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	44622000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.059
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	-0.017
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.041
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.382
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.037
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.004
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.175
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.308
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.042
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Meals And Entertainment EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.033
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Meals And Entertainment EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.113
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Meals And Entertainment EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainment	0.026
CY2020	blkb	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits	0.013
CY2019	blkb	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits	0.044
CY2018	blkb	Effective Income Tax Rate Reconciliation Unrecognized Tax Benefits EffectiveIncomeTaxRateReconciliationUnrecognizedTaxBenefits	-0.026
CY2018	blkb	Effective Income Tax Rate Reconciliation Global Intangible Low Tax Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomePercent	0
CY2020	blkb	Effective Income Tax Rate Reconciliation Global Intangible Low Tax Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomePercent	0.013
CY2019	blkb	Effective Income Tax Rate Reconciliation Global Intangible Low Tax Income Percent EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomePercent	0.059
CY2020	blkb	Effective Income Tax Rate Reconciliation Deduction Tcjafdii Percent EffectiveIncomeTaxRateReconciliationDeductionTCJAFDIIPercent	0
CY2019	blkb	Effective Income Tax Rate Reconciliation Deduction Tcjafdii Percent EffectiveIncomeTaxRateReconciliationDeductionTCJAFDIIPercent	-0.015
CY2018	blkb	Effective Income Tax Rate Reconciliation Deduction Tcjafdii Percent EffectiveIncomeTaxRateReconciliationDeductionTCJAFDIIPercent	-0.007
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.012
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.202
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.174
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.017
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.003
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.002
CY2020	blkb	Effective Income Tax Rate Reconciliation Tax Credits State And Local EffectiveIncomeTaxRateReconciliationTaxCreditsStateAndLocal	0.023
CY2019	blkb	Effective Income Tax Rate Reconciliation Tax Credits State And Local EffectiveIncomeTaxRateReconciliationTaxCreditsStateAndLocal	0.154
CY2018	blkb	Effective Income Tax Rate Reconciliation Tax Credits State And Local EffectiveIncomeTaxRateReconciliationTaxCreditsStateAndLocal	0.019
CY2020	blkb	Effective Income Tax Rate Reconciliation Dta Adjustments EffectiveIncomeTaxRateReconciliationDTAAdjustments	-0.033
CY2019	blkb	Effective Income Tax Rate Reconciliation Dta Adjustments EffectiveIncomeTaxRateReconciliationDTAAdjustments	0
CY2018	blkb	Effective Income Tax Rate Reconciliation Dta Adjustments EffectiveIncomeTaxRateReconciliationDTAAdjustments	0
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.041
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.106
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Prior Year Income Taxes EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes	-0.016
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.174
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.376
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.104
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.017
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.018
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.020
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.643
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.125
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.005
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	5592000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	9203000	USD
CY2020Q4	blkb	Deferred Tax Assets Tax Credit Carryforwards State And Foreign DeferredTaxAssetsTaxCreditCarryforwardsStateAndForeign	42598000	USD
CY2019Q4	blkb	Deferred Tax Assets Tax Credit Carryforwards State And Foreign DeferredTaxAssetsTaxCreditCarryforwardsStateAndForeign	24435000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	17434000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	11717000	USD
CY2020Q4	blkb	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	13375000	USD
CY2019Q4	blkb	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	35620000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	2399000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	1374000	USD
CY2020Q4	blkb	Deferred Tax Asset Intangible Assets DeferredTaxAssetIntangibleAssets	1663000	USD
CY2019Q4	blkb	Deferred Tax Asset Intangible Assets DeferredTaxAssetIntangibleAssets	1560000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	524000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Deferred Income DeferredTaxAssetsDeferredIncome	682000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Bonuses DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses	0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Bonuses DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses	1713000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	9111000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	7487000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	45757000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	92696000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	93791000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	46569000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	28804000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Software DeferredTaxLiabilitiesDeferredExpenseCapitalizedSoftware	26107000	USD
CY2020Q4	blkb	Deferred Tax Liabilities Deferred Expense Sales Commissions DeferredTaxLiabilitiesDeferredExpenseSalesCommissions	20256000	USD
CY2019Q4	blkb	Deferred Tax Liabilities Deferred Expense Sales Commissions DeferredTaxLiabilitiesDeferredExpenseSalesCommissions	21128000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	12333000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	32888000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	8458000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	4446000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	398000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	315000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	116006000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	131453000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	29184000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6453000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	52494000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	44115000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	8300000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1183000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6453000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	29184000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6855000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6453000	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7205000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	6855000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4346000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3704000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	5160000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	414000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	104000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	614000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	385000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	413000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	491000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	456000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	58000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	12000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	612000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1205000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4625000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4346000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3704000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4200000	USD
CY2020Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	1100000	USD
CY2019Q4	us-gaap	Income Tax Examination Penalties And Interest Accrued IncomeTaxExaminationPenaltiesAndInterestAccrued	1000000.0	USD
CY2020Q4	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	1100000	USD
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	4779951	shares
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	87257000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	58633000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	48274000	USD
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	98700000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y4M24D
CY2020Q1	blkb	Annual Dividendper Share Approved AnnualDividendperShareApproved	0.48
CY2020Q1	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.12
CY2020Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	250000000.0	USD
CY2020	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	714000	shares
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	41000000.0	USD
CY2020Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	209000000.0	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5290000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5110000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-642000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1625000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	860000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-239000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-2497000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5290000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-5110000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2020	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2019	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	1900000	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8700000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	8100000	USD
CY2018	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0	USD
CY2019	us-gaap	Defined Contribution Plan Employer Discretionary Contribution Amount DefinedContributionPlanEmployerDiscretionaryContributionAmount	0	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	105177000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	35546000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	755000000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Percentage RevenueRemainingPerformanceObligationPercentage	0.60
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1	P12M
CY2020Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	316914000	USD
CY2019Q4	us-gaap	Contract With Customer Liability ContractWithCustomerLiability	316137000	USD
CY2020	us-gaap	Contract With Customer Liability Revenue Recognized ContractWithCustomerLiabilityRevenueRecognized	311000000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	913219000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	900423000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	848606000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	913219000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	900423000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	848606000	USD
CY2020Q4	us-gaap	Revenues Revenues	242606000	USD
CY2020Q3	us-gaap	Revenues Revenues	215001000	USD
CY2020Q2	us-gaap	Revenues Revenues	231991000	USD
CY2020Q1	us-gaap	Revenues Revenues	223621000	USD
CY2020Q4	us-gaap	Gross Profit GrossProfit	123030000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	116316000	USD
CY2020Q2	us-gaap	Gross Profit GrossProfit	127052000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	118756000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	-850000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	10087000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	19582000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	8424000	USD
CY2020Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-6672000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	6632000	USD
CY2020Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	16319000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	5335000	USD
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	-13621000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	4876000	USD
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	11823000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	4639000	USD
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.28
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.28
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.24
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.10
CY2019Q4	us-gaap	Revenues Revenues	237839000	USD
CY2019Q3	us-gaap	Revenues Revenues	221120000	USD
CY2019Q2	us-gaap	Revenues Revenues	225634000	USD
CY2019Q1	us-gaap	Revenues Revenues	215830000	USD
CY2019Q4	us-gaap	Gross Profit GrossProfit	121302000	USD
CY2019Q3	us-gaap	Gross Profit GrossProfit	119323000	USD
CY2019Q2	us-gaap	Gross Profit GrossProfit	124827000	USD
CY2019Q1	us-gaap	Gross Profit GrossProfit	116547000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	3586000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	7883000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	13491000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	2185000	USD
CY2019Q4	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-1262000	USD
CY2019Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	4930000	USD
CY2019Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9873000	USD
CY2019Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-2956000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	1324000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	4566000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	7140000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	-1122000	USD
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.03
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.10
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.15
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.02
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.03
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.09
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.15
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.02
CY2019	us-gaap	Restructuring Costs RestructuringCosts	5800000	USD
CY2018	us-gaap	Restructuring Costs RestructuringCosts	4600000	USD

Files In Submission

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2020 Q4 Form 10-K Financial Statement

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2020 Q4 Form 10-K Financial Statement

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