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Note 10 - Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Aug. 31, 2014
Feb. 06, 2015
Note 10 - Intangible Assets (Details) [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years 6 months      
Impairment of Intangible Assets (Excluding Goodwill)     $ 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill   $ 0us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill  
Acquired Finite-lived Intangible Asset, Residual Value 0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue   0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue      
Amortization of Intangible Assets 2.0us-gaap_AmortizationOfIntangibleAssets 2.2us-gaap_AmortizationOfIntangibleAssets 4.1us-gaap_AmortizationOfIntangibleAssets 3.9us-gaap_AmortizationOfIntangibleAssets    
Code Red, Inc. [Member]            
Note 10 - Intangible Assets (Details) [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 6 years 109 days          
Finite-lived Intangible Assets Acquired $ 8.2us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= fds_CodeRedIncMember
        $ 8.2us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= fds_CodeRedIncMember