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Note 12 - Stockholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 0 Months Ended 6 Months Ended 3 Months Ended 0 Months Ended
Dec. 15, 2014
Feb. 28, 2015
Feb. 28, 2014
Nov. 30, 2014
Feb. 06, 2015
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, Par or Stated Value Per Share (in Dollars per share)   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare       $ 0.01us-gaap_CommonStockParOrStatedValuePerShare  
Common Stock, Shares, Issued   49,714,486us-gaap_CommonStockSharesIssued       49,110,218us-gaap_CommonStockSharesIssued  
Treasury Stock, Shares   8,084,228us-gaap_TreasuryStockShares       7,317,416us-gaap_TreasuryStockShares  
Common Stock, Shares, Outstanding   41,630,258us-gaap_CommonStockSharesOutstanding 42,362,000us-gaap_CommonStockSharesOutstanding     41,792,802us-gaap_CommonStockSharesOutstanding 43,324,000us-gaap_CommonStockSharesOutstanding
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares   20,000us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued 0us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued        
Stock Repurchase Program, Additional Amount Authorized (in Dollars) $ 300fds_StockRepurchaseProgramAdditionalAmountAuthorized            
Treasury Stock, Shares, Acquired   769,854us-gaap_TreasuryStockSharesAcquired          
Treasury Stock, Value, Acquired, Cost Method (in Dollars)   104.1us-gaap_TreasuryStockValueAcquiredCostMethod          
Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars)   282.9us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1          
Shares Paid for Tax Withholding for Share Based Compensation   17,165us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation 21,289us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation        
Restricted Stock [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		 79,774us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 53,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 [1]      
Shares Paid for Tax Withholding for Share Based Compensation   17,165us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 21,289us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Code Red, Inc. [Member]              
Note 12 - Stockholders' Equity (Details) [Line Items]              
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares         20,207us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= fds_CodeRedIncMember		    
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned (in Dollars)         $ 3.0us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned
/ us-gaap_BusinessAcquisitionAxis
= fds_CodeRedIncMember		    
[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.