$SEIC
SEI INVESTMENTS CO Stock $seic

$seic Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000035089421000053 Filed on October 25, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue	$501.7M	$485.3M	$424.9M
YoY Change	13.05%	14.21%	2.08%
Cost Of Revenue	$83.57M	$77.09M	$68.80M
YoY Change	16.87%	12.05%	4.88%
Gross Profit	$418.1M	$162.5M	$129.4M
YoY Change	12.33%	25.59%	-5.48%
Gross Profit Margin	83.34%	33.48%	30.45%
Selling, General & Admin	$250.9M	$244.0M	$223.6M
YoY Change	10.69%	9.13%	6.63%
% of Gross Profit	60.02%	150.19%	172.83%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$23.74M	$8.408M	$7.945M
YoY Change	10.43%	5.83%	7.23%
% of Gross Profit	5.68%	5.17%	6.14%
Operating Expenses	$274.7M	$267.1M	$244.8M
YoY Change	10.67%	9.11%	6.43%
Operating Profit	$143.4M	$141.1M	$111.3M
YoY Change	15.64%	26.75%	-7.71%
Interest Expense	$34.38M	$101.0K	$153.0K
YoY Change	5.78%	-33.99%	-0.65%
% of Operating Profit	23.97%	0.07%	0.14%
Other Income/Expense, Net
YoY Change
Pretax Income	$177.8M	$176.3M	$141.3M
YoY Change	13.58%	24.83%	-13.26%
Income Tax	$32.48M	$38.30M	$30.18M
% Of Pretax Income	18.27%	21.72%	21.36%
Net Earnings	$145.3M	$138.0M	$111.1M
YoY Change	15.43%	24.26%	-15.94%
Net Earnings / Revenue	28.96%	28.44%	26.14%
Basic Earnings Per Share		$0.98	$0.76
Diluted Earnings Per Share	$1.028M	$0.97	$0.75
COMMON SHARES
Basic Shares Outstanding	139.5M shares	141.1M shares	146.5M shares
Diluted Shares Outstanding		142.4M shares	147.9M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$859.7M	$825.7M	$803.5M
YoY Change	5.0%	2.76%	0.35%
Cash & Equivalents	$831.4M	$793.9M	$767.7M
Short-Term Investments	$28.27M	$31.77M	$35.80M
Other Short-Term Assets	$43.56M	$42.62M	$38.48M
YoY Change	12.57%	10.76%	10.26%
Inventory
Prepaid Expenses
Receivables	$441.6M	$442.2M	$378.2M
Other Receivables	$16.75M	$18.40M	$13.20M
Total Short-Term Assets	$1.404B	$1.371B	$1.275B
YoY Change	7.94%	7.51%	2.8%
LONG-TERM ASSETS
Property, Plant & Equipment	$178.9M	$183.8M	$180.5M
YoY Change	-5.39%	1.81%	16.79%
Goodwill	$117.2M	$64.49M	$64.49M
YoY Change	81.79%	0.0%	0.0%
Intangibles	$68.78M	$31.99M	$25.23M
YoY Change	183.01%	26.83%	-12.74%
Long-Term Investments	$244.4M	$186.8M	$154.9M
YoY Change	16.37%	20.62%	4.24%
Other Assets	$24.94M	$32.22M	$32.51M
YoY Change	-22.77%	-0.87%	1.24%
Total Long-Term Assets	$950.5M	$821.2M	$810.7M
YoY Change	9.72%	1.29%	1.28%
TOTAL ASSETS
Total Short-Term Assets	$1.404B	$1.371B	$1.275B
Total Long-Term Assets	$950.5M	$821.2M	$810.7M
Total Assets	$2.355B	$2.192B	$2.086B
YoY Change	8.65%	5.09%	2.21%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$10.31M	$10.77M	$13.04M
YoY Change	32.78%	-17.38%	49.66%
Accrued Expenses	$324.4M	$231.0M	$223.2M
YoY Change	8.18%	3.51%	15.11%
Deferred Revenue	$9.721M	$1.235M	$5.815M
YoY Change	795.94%	-78.76%	5.17%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$355.7M	$253.5M	$250.5M
YoY Change	12.12%	1.18%	15.95%
LONG-TERM LIABILITIES
Long-Term Debt	$40.00M	$0.00	$0.00
YoY Change
Other Long-Term Liabilities	$20.88M	$22.16M	$22.52M
YoY Change	4.11%	-1.61%	-14.35%
Total Long-Term Liabilities	$20.88M	$22.16M	$22.52M
YoY Change	4.11%	-1.61%	-14.35%
TOTAL LIABILITIES
Total Short-Term Liabilities	$355.7M	$253.5M	$250.5M
Total Long-Term Liabilities	$20.88M	$22.16M	$22.52M
Total Liabilities	$493.9M	$353.7M	$356.2M
YoY Change	15.58%	-0.69%	5.6%
SHAREHOLDERS EQUITY
Retained Earnings	$632.6M	$629.2M	$581.2M
YoY Change	11.91%	8.24%	-3.12%
Common Stock	$1.248B	$1.229B	$1.176B
YoY Change	4.75%	4.58%	3.2%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.861B	$1.838B	$1.729B
YoY Change
Total Liabilities & Shareholders Equity	$2.355B	$2.192B	$2.086B
YoY Change	8.65%	5.09%	2.21%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$145.3M	$138.0M	$111.1M
YoY Change	15.43%	24.26%	-15.94%
Depreciation, Depletion And Amortization	$23.74M	$8.408M	$7.945M
YoY Change	10.43%	5.83%	7.23%
Cash From Operating Activities	$149.2M	$158.9M	$132.4M
YoY Change	61.84%	20.0%	-19.22%
INVESTING ACTIVITIES
Capital Expenditures	-$10.53M	-$14.27M	-$14.80M
YoY Change	-37.32%	-3.61%	-25.63%
Acquisitions
YoY Change
Other Investing Activities	-$66.81M	-$17.19M	-$12.10M
YoY Change	-591.26%	42.06%	-268.06%
Cash From Investing Activities	-$77.34M	-$31.46M	-$26.80M
YoY Change	2243.67%	17.37%	111.02%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-34.93M	-109.5M	-102.4M
YoY Change	-56.5%	6.89%	65.7%
NET CHANGE
Cash From Operating Activities	149.2M	158.9M	132.4M
Cash From Investing Activities	-77.34M	-31.46M	-26.80M
Cash From Financing Activities	-34.93M	-109.5M	-102.4M
Net Change In Cash	36.95M	17.97M	3.200M
YoY Change	329.65%	461.72%	-96.42%
FREE CASH FLOW
Cash From Operating Activities	$149.2M	$158.9M	$132.4M
Capital Expenditures	-$10.53M	-$14.27M	-$14.80M
Free Cash Flow	$159.8M	$173.1M	$147.2M
YoY Change	46.56%	17.63%	-19.91%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0000350894
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
CY2021Q3	us-gaap	Other Assets Current OtherAssetsCurrent	42615000	USD
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	0-10200
	dei	Entity Registrant Name EntityRegistrantName	SEI INVESTMENTS COMPANY
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	PA
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	23-1707341
	dei	Entity Address Address Line1 EntityAddressAddressLine1	1 Freedom Valley Drive
	dei	Entity Address City Or Town EntityAddressCityOrTown	Oaks
	dei	Entity Address State Or Province EntityAddressStateOrProvince	PA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	19456
	dei	City Area Code CityAreaCode	610
	dei	Local Phone Number LocalPhoneNumber	676-1000
	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
	dei	Trading Symbol TradingSymbol	SEIC
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	86488000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	176346000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	141274000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	515898000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	412181000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	38301000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	30178000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	114605000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	90777000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	138045000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	111096000	USD
	us-gaap	Net Income Loss NetIncomeLoss	401293000	USD
	us-gaap	Net Income Loss NetIncomeLoss	321404000	USD
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.98
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.76
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.18
CY2021Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	140507000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	145812000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	141928000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	147586000	shares
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.75
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.79
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.14
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	142426000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	147907000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143981000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	149958000	shares
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.37
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.35
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	138045000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	111096000	USD
	us-gaap	Net Income Loss NetIncomeLoss	401293000	USD
	us-gaap	Net Income Loss NetIncomeLoss	321404000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-5546000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	7085000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2867000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-5051000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	208000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	154000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	453000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-218000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-713000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-542000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-1548000	USD
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	702000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	67000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	63000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	190000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	126000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-238000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-238000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-670000	USD
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-455000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6021000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6781000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3745000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3894000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	132024000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	117877000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	397548000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	317510000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	1805606000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	138045000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6021000	USD
CY2021Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	119895000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1120000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	7915000	USD
CY2021Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	11318000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	1838088000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	1708625000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	111096000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	6781000	USD
CY2020Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	108742000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1153000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4053000	USD
CY2020Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6467000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	1729433000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1739907000	USD
	us-gaap	Net Income Loss NetIncomeLoss	401293000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3745000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	316053000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3225000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	34677000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	31173000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.37
	us-gaap	Dividends Common Stock DividendsCommonStock	52389000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	1838088000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1738778000	USD
	us-gaap	Net Income Loss NetIncomeLoss	321404000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3894000	USD
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	325644000	USD
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	3401000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	26392000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	20458000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.35
	us-gaap	Dividends Common Stock DividendsCommonStock	51462000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	1729433000	USD
	us-gaap	Net Income Loss NetIncomeLoss	401293000	USD
	us-gaap	Net Income Loss NetIncomeLoss	321404000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	82588000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	75120000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	483881000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	396524000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	327079000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	37902000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	22520000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	43113000	USD
	us-gaap	Payments For Software PaymentsForSoftware	19486000	USD
	us-gaap	Payments For Software PaymentsForSoftware	18640000	USD
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	168333000	USD
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	114407000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	133895000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	112575000	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	327000	USD
	us-gaap	Proceeds From Sale And Maturity Of Marketable Securities ProceedsFromSaleAndMaturityOfMarketableSecurities	842000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	11425000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	1500000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-87542000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-64243000	USD
	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	3965000	USD
	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	633000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	315811000	USD
	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	29793000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	105516000	USD
	us-gaap	Payments Of Dividends PaymentsOfDividends	103914000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-387390000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-401833000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2442000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-4196000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	6507000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-73748000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	787727000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	844547000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	794234000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	770799000	USD
	us-gaap	Capitalized Computer Software Additions CapitalizedComputerSoftwareAdditions	19486000	USD
	us-gaap	Capitalized Computer Software Additions CapitalizedComputerSoftwareAdditions	18640000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	138045000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	111096000	USD
	us-gaap	Net Income Loss NetIncomeLoss	401293000	USD
	us-gaap	Net Income Loss NetIncomeLoss	321404000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	140507000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	145812000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	141928000	shares
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	147586000	shares
CY2021Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1919000	shares
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2095000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2053000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	2372000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	142426000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	147907000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143981000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	149958000	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.98
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.76
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.18
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.97
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.75
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.79
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.14
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	11347000	shares
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	8813000	shares
CY2021Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Net Income Per Outstanding Unit Amount AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount	57.80
CY2020Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Net Income Per Outstanding Unit Amount AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount	57.98
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	11531000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	8342000	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Net Income Per Outstanding Unit Amount AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount	57.78
	us-gaap	Antidilutive Securities Excluded From Computation Of Net Income Per Outstanding Unit Amount AntidilutiveSecuritiesExcludedFromComputationOfNetIncomePerOutstandingUnitAmount	58.18
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%;text-decoration:underline">Reclassifications</span></div><div style="margin-top:5pt"><span style="color:#000000;font-family:'Arial',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain prior year amounts have been reclassified to conform to current year presentation.</span></div>
	us-gaap	Net Income Loss NetIncomeLoss	401293000	USD
	us-gaap	Net Income Loss NetIncomeLoss	321404000	USD
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	25141000	USD
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	23058000	USD
	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	43749000	USD
	us-gaap	Amortization Of Deferred Charges AmortizationOfDeferredCharges	39417000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	103420000	USD
	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	86488000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	110559000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	107180000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	31173000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20458000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	1569000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	109000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	6639000	USD
	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	7731000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	134000	USD
	us-gaap	Gain Loss On Investments GainLossOnInvestments	-1310000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	2103000	USD
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-4442000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-314000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	965000	USD
	seic	Capitalized Contract Costs Net Of Amortization CapitalizedContractCostsNetOfAmortization	482000	USD
	seic	Capitalized Contract Costs Net Of Amortization CapitalizedContractCostsNetOfAmortization	2842000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-921000	USD
	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	1053000	USD
	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	4537000	USD
	us-gaap	Increase Decrease In Other Receivables IncreaseDecreaseInOtherReceivables	-2521000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	58537000	USD
	us-gaap	Increase Decrease In Receivables IncreaseDecreaseInReceivables	37921000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	3919000	USD
	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	6186000	USD
	us-gaap	Increase Decrease Due From Affiliates IncreaseDecreaseDueFromAffiliates	-51422000	USD
	us-gaap	Increase Decrease Due From Affiliates IncreaseDecreaseDueFromAffiliates	-12641000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	3006000	USD
	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	8615000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-9851000	USD
	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	8809000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	150000	USD
	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	-1370000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	82588000	USD
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CY2020Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	25046000	USD
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CY2020Q4	seic	Receivables Gross Current ReceivablesGrossCurrent	386319000	USD
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CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	378639000	USD
CY2021Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	183802000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	189052000	USD
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	25141000	USD
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	23058000	USD
CY2021Q3	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	34263000	USD
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	33781000	USD
CY2021Q3	seic	Capitalized Contract Cost Amount Capitalized During Period CapitalizedContractCostAmountCapitalizedDuringPeriod	2932000	USD
CY2020Q3	seic	Capitalized Contract Cost Amount Capitalized During Period CapitalizedContractCostAmountCapitalizedDuringPeriod	2521000	USD
	seic	Capitalized Contract Cost Amount Capitalized During Period CapitalizedContractCostAmountCapitalizedDuringPeriod	6978000	USD
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CY2021Q3	us-gaap	Accrued Salaries Current AccruedSalariesCurrent	86924000	USD
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CY2020Q4	us-gaap	Accrued Professional Fees Current AccruedProfessionalFeesCurrent	31907000	USD
CY2021Q3	seic	Accrued Sub Advisory Distribution And Other Asset Management Fees Current AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent	57560000	USD
CY2020Q4	seic	Accrued Sub Advisory Distribution And Other Asset Management Fees Current AccruedSubAdvisoryDistributionAndOtherAssetManagementFeesCurrent	49924000	USD
CY2021Q3	us-gaap	Dividends Payable Current DividendsPayableCurrent	0	USD
CY2020Q4	us-gaap	Dividends Payable Current DividendsPayableCurrent	53127000	USD
CY2021Q3	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	38871000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	50461000	USD
CY2021Q3	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	231043000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	299845000	USD
CY2021Q3	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	31770000	USD
CY2021Q3	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	178742000	USD
CY2020Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	34064000	USD
CY2020Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	145649000	USD
CY2021Q3	seic	Debt Securities Available For Sale And Equity Securities Fvni Cost DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost	138588000	USD
CY2021Q3	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Gain Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax	1491000	USD
CY2021Q3	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Loss Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax	0	USD
CY2021Q3	seic	Debt Securities Available For Sale And Equity Securities Fvni DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNI	140079000	USD
CY2020Q4	seic	Debt Securities Available For Sale And Equity Securities Fvni Cost DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNICost	102549000	USD
CY2020Q4	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Gain Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax	2870000	USD
CY2020Q4	seic	Debt Securities Available For Sale And Equity Securities Fvni Accumulated Gross Unrealized Loss Before Tax DebtSecuritiesAvailableForSaleAndEquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax	0	USD
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CY2021Q3	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	673000	USD
CY2021Q3	seic	Accumulated Other Comprehensive Income Loss Debt Securities Available For Sale Securities Adjustment Tax AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax	201000	USD
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CY2020Q4	seic	Accumulated Other Comprehensive Income Loss Debt Securities Available For Sale Securities Adjustment Tax AccumulatedOtherComprehensiveIncomeLossDebtSecuritiesAvailableForSaleSecuritiesAdjustmentTax	464000	USD
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	us-gaap	Equity Securities Fv Ni Realized Gain EquitySecuritiesFvNiRealizedGain	254000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3932000	USD
	us-gaap	Equity Securities Fv Ni Realized Loss EquitySecuritiesFvNiRealizedLoss	250000	USD
CY2021Q3	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	31770000	USD
CY2020Q4	us-gaap	Financial Instruments Owned Us Government And Agency Obligations At Fair Value FinancialInstrumentsOwnedUSGovernmentAndAgencyObligationsAtFairValue	34064000	USD
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11318000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6467000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	31173000	USD
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20458000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1857000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1229000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	5615000	USD
CY2021Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	9461000	USD
CY2020Q3	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	5238000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	25558000	USD
	us-gaap	Allocated Share Based Compensation Expense Net Of Tax AllocatedShareBasedCompensationExpenseNetOfTax	16526000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	3209000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Plan Modification Incremental Compensation Cost ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	0	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	72399000	USD
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	30496000	USD
CY2021Q3	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	104146000	USD
CY2021Q3	us-gaap	Share Price SharePrice	59.30
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	40.63
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	16925000	shares
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	5578000	shares
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.37
	us-gaap	Dividends Common Stock DividendsCommonStock	52389000	USD
	us-gaap	Dividends Common Stock DividendsCommonStock	51462000	USD
	us-gaap	Oci Before Reclassifications Net Of Tax Attributable To Parent OciBeforeReclassificationsNetOfTaxAttributableToParent	-4415000	USD
	us-gaap	Reclassification From Aoci Current Period Net Of Tax Attributable To Parent ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent	-670000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3745000	USD
CY2021Q3	us-gaap	Revenues Revenues	485322000	USD
CY2021Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	322843000	USD
CY2021Q3	us-gaap	Gross Profit GrossProfit	162479000	USD
CY2020Q3	us-gaap	Revenues Revenues	424927000	USD
CY2020Q3	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	295550000	USD
CY2020Q3	us-gaap	Gross Profit GrossProfit	129377000	USD
CY2021Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	141125000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	111337000	USD
CY2021Q3	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	14266000	USD
CY2020Q3	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	14778000	USD
CY2021Q3	us-gaap	Depreciation Depreciation	8408000	USD
CY2020Q3	us-gaap	Depreciation Depreciation	7945000	USD
CY2021Q3	us-gaap	Adjustment For Amortization AdjustmentForAmortization	14674000	USD
CY2020Q3	us-gaap	Adjustment For Amortization AdjustmentForAmortization	13200000	USD
	us-gaap	Revenues Revenues	1416659000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	941484000	USD
	us-gaap	Gross Profit GrossProfit	475175000	USD
	us-gaap	Revenues Revenues	1240335000	USD
	us-gaap	Operating Costs And Expenses OperatingCostsAndExpenses	865044000	USD
	us-gaap	Gross Profit GrossProfit	375291000	USD
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	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	42006000	USD
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	us-gaap	Depreciation Depreciation	25141000	USD
	us-gaap	Depreciation Depreciation	23058000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	43749000	USD
	us-gaap	Adjustment For Amortization AdjustmentForAmortization	39417000	USD
CY2021Q3	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	16721000	USD
CY2020Q4	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	15911000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	16532000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	15761000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1835000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2105000	USD
CY2021Q3	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	16721000	USD
CY2020Q4	seic	Gross Liability For Unrecognized Tax Benefits Exclusive Of Interest And Penalties GrossLiabilityForUnrecognizedTaxBenefitsExclusiveOfInterestAndPenalties	15911000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1835000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2105000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18556000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18016000	USD
CY2021Q3	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	4497000	USD
CY2020Q4	us-gaap	Liability For Uncertain Tax Positions Current LiabilityForUncertainTaxPositionsCurrent	6546000	USD
CY2021Q3	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	14059000	USD
CY2020Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	11470000	USD
CY2021Q3	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18556000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18016000	USD
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.025
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.033
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CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.001
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.002
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CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.006
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.004
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	us-gaap	Effective Income Tax Rate Reconciliation Share Based Compensation Excess Tax Benefit Percent EffectiveIncomeTaxRateReconciliationShareBasedCompensationExcessTaxBenefitPercent	-0.010
CY2021Q3	seic	Effective Income Tax Rate Reconciliation Expiration Of The Statute Of Limitations Percent EffectiveIncomeTaxRateReconciliationExpirationOfTheStatuteOfLimitationsPercent	0
CY2020Q3	seic	Effective Income Tax Rate Reconciliation Expiration Of The Statute Of Limitations Percent EffectiveIncomeTaxRateReconciliationExpirationOfTheStatuteOfLimitationsPercent	-0.013
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CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	-0.003
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0
	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	-0.002
	us-gaap	Effective Income Tax Rate Reconciliation Tax Settlements EffectiveIncomeTaxRateReconciliationTaxSettlements	0
CY2021Q3	seic	Effective Income Tax Rate Reconciliation Provision To Return Adjustments Percent EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsPercent	-0.005
CY2020Q3	seic	Effective Income Tax Rate Reconciliation Provision To Return Adjustments Percent EffectiveIncomeTaxRateReconciliationProvisionToReturnAdjustmentsPercent	-0.004
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CY2021Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.003
CY2020Q3	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.006
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CY2021Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.217
CY2020Q3	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.214
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.222
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.220
CY2021Q3	us-gaap	Loss Contingency Pending Claims Number LossContingencyPendingClaimsNumber	7	lawsuit
CY2021Q3	us-gaap	Loss Contingency Pending Claims Number LossContingencyPendingClaimsNumber	7	lawsuit
	us-gaap	Goodwill Period Increase Decrease GoodwillPeriodIncreaseDecrease	0	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2763000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2763000	USD
CY2021Q3	us-gaap	Revenues Revenues	485322000	USD
CY2021Q3	us-gaap	Revenues Revenues	485322000	USD
CY2020Q3	us-gaap	Revenues Revenues	424927000	USD
CY2020Q3	us-gaap	Revenues Revenues	424927000	USD
	us-gaap	Revenues Revenues	1416659000	USD
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	us-gaap	Revenues Revenues	1240335000	USD
	us-gaap	Revenues Revenues	1240335000	USD

Files In Submission

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$SEIC
SEI INVESTMENTS CO Stock $seic

2021 Q4 Form 10-Q Financial Statement

#000035089421000053 Filed on October 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SEIC SEI INVESTMENTS CO Stock $seic

2021 Q4 Form 10-Q Financial Statement

#000035089421000053 Filed on October 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SEIC
SEI INVESTMENTS CO Stock $seic