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Note 12 - Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 0 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Dec. 15, 2014
Aug. 31, 2014
Aug. 31, 2013
Note 12 - Stockholders' Equity (Details) [Line Items]          
Preferred Stock, Shares Authorized 10,000,000us-gaap_PreferredStockSharesAuthorized     10,000,000us-gaap_PreferredStockSharesAuthorized  
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare  
Preferred Stock, Shares Issued 0us-gaap_PreferredStockSharesIssued     0us-gaap_PreferredStockSharesIssued  
Preferred Stock, Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding     0us-gaap_PreferredStockSharesOutstanding  
Common Stock, Shares Authorized 150,000,000us-gaap_CommonStockSharesAuthorized     150,000,000us-gaap_CommonStockSharesAuthorized  
Common Stock, Shares, Issued 49,293,340us-gaap_CommonStockSharesIssued     49,110,218us-gaap_CommonStockSharesIssued  
Treasury Stock, Shares 7,714,435us-gaap_TreasuryStockShares     7,317,416us-gaap_TreasuryStockShares  
Common Stock, Shares, Outstanding 41,578,905us-gaap_CommonStockSharesOutstanding 42,988,000us-gaap_CommonStockSharesOutstanding   41,792,802us-gaap_CommonStockSharesOutstanding 43,324,000us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares, Acquired 379,854us-gaap_TreasuryStockSharesAcquired        
Treasury Stock, Value, Acquired, Cost Method (in Dollars) $ 48.4us-gaap_TreasuryStockValueAcquiredCostMethod        
Shares Paid for Tax Withholding for Share Based Compensation 17,165us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 20,777us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation      
Payments Related to Tax Withholding for Share-based Compensation (in Dollars) 2.2us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 2.3us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 53,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod [1]        
Restricted Stock [Member] | Previously Granted Awards [Member]          
Note 12 - Stockholders' Equity (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 53,495us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementScenarioAxis
= fds_PreviouslyGrantedAwardsMember		        
Restricted Stock [Member]          
Note 12 - Stockholders' Equity (Details) [Line Items]          
Shares Paid for Tax Withholding for Share Based Compensation 17,165us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 20,777us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   62,544us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
Subsequent Event [Member]          
Note 12 - Stockholders' Equity (Details) [Line Items]          
Stock Repurchase Program,Additional Amount Authorized (in Dollars)     300fds_StockRepurchaseProgramAdditionalAmountAuthorized
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars)     $ 338.7us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
[1] All of the 53,495 restricted stock awards that vested during the first quarter of fiscal 2015 related to awards granted on October 23, 2009. These restricted stock awards cliff vested 100% after five years on October 23, 2014 and were amortized to expense over the vesting period using the straight-line attribution method.