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Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant
 3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Restricted stock awards granted* 10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod  
Share-based awards canceled/forfeited* 33,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod  
Non-Performance Based [Member] | Employee Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Granted (463,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= fds_NonPerformanceBasedMember
/ us-gaap_PlanNameAxis
= fds_EmployeeOptionPlanMember		  
Non-Performance Based [Member] | Non-Employee Stock Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= fds_NonPerformanceBasedMember
/ us-gaap_PlanNameAxis
= fds_NonEmployeeStockOptionPlanMember		  
Performance Based [Member] | Employee Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= fds_PerformanceBasedMember
/ us-gaap_PlanNameAxis
= fds_EmployeeOptionPlanMember		  
Performance Based [Member] | Non-Employee Stock Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Granted 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= fds_PerformanceBasedMember
/ us-gaap_PlanNameAxis
= fds_NonEmployeeStockOptionPlanMember		  
Restricted Stock [Member] | Employee Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Restricted stock awards granted* 26,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= fds_EmployeeOptionPlanMember		 [1]  
Restricted Stock [Member] | Non-Employee Stock Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Restricted stock awards granted* 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= fds_NonEmployeeStockOptionPlanMember		 [1]  
Restricted Stock [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Restricted stock awards granted* 10,225us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 161,716us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Employee Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Balance 3,222,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= fds_EmployeeOptionPlanMember		  
Share-based awards canceled/forfeited* 35,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= fds_EmployeeOptionPlanMember		 [1]  
Balance 2,820,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= fds_EmployeeOptionPlanMember		  
Non-Employee Stock Option Plan [Member]    
Note 13 - Employee Stock Option and Retirement Plans (Details) - Summary of Share-Based Awards Available For Grant [Line Items]    
Balance 102,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= fds_NonEmployeeStockOptionPlanMember		  
Share-based awards canceled/forfeited* 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_PlanNameAxis
= fds_NonEmployeeStockOptionPlanMember		 [1]  
Balance 102,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= fds_NonEmployeeStockOptionPlanMember		  
[1] Under the Company's option plan, for each restricted stock award canceled/forfeited, an equivalent of 2.5 shares is added back to the available share-based awards balance.