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Note 16 - Commitments and Contingencies (Details) (USD $)
3 Months Ended 12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Aug. 31, 2014
Note 16 - Commitments and Contingencies (Details) [Line Items]      
Operating Leases, Rent Expense $ 9,700,000us-gaap_LeaseAndRentalExpense $ 8,900,000us-gaap_LeaseAndRentalExpense  
Other Liabilities, Noncurrent 15,901,000us-gaap_OtherLiabilitiesNoncurrent   16,417,000us-gaap_OtherLiabilitiesNoncurrent
Operating Leases, Future Minimum Payments Due 205,906,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Long-term Purchase Commitment, Amount     53,300,000us-gaap_LongTermPurchaseCommitmentAmount
Largest Individual Client Percent of Total Subscriptions 2.00%fds_LargestIndividualClientPercentOfTotalSubscriptions    
Percentage of Subscription from Ten Largest Clients 15.00%fds_PercentageOfSubscriptionFromTenLargestClients    
Allowance for Doubtful Accounts Receivable 1,600,000us-gaap_AllowanceForDoubtfulAccountsReceivable   1,700,000us-gaap_AllowanceForDoubtfulAccountsReceivable
Deferred Rent [Member]      
Note 16 - Commitments and Contingencies (Details) [Line Items]      
Other Liabilities 17,100,000us-gaap_OtherLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= fds_DeferredRentMember
18,300,000us-gaap_OtherLiabilities
/ us-gaap_FairValueByLiabilityClassAxis
= fds_DeferredRentMember
 
Other Liabilities, Noncurrent 14,200,000us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_FairValueByLiabilityClassAxis
= fds_DeferredRentMember
14,900,000us-gaap_OtherLiabilitiesNoncurrent
/ us-gaap_FairValueByLiabilityClassAxis
= fds_DeferredRentMember
 
Standby Letters of Credit [Member]      
Note 16 - Commitments and Contingencies (Details) [Line Items]      
Long-term Line of Credit 1,700,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
   
Norwalk, Connecticut [Member]      
Note 16 - Commitments and Contingencies (Details) [Line Items]      
Area of Real Estate Property (in Square Feet) 193,000us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= fds_NorwalkConnecticutMember
   
Office Space [Member]      
Note 16 - Commitments and Contingencies (Details) [Line Items]      
Area of Real Estate Property (in Square Feet) 827,500us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= fds_OfficeSpaceMember
   
Boston, Massachusetts [Member]      
Note 16 - Commitments and Contingencies (Details) [Line Items]      
Area of Real Estate Property (in Square Feet) 4,809us-gaap_AreaOfRealEstateProperty
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= fds_BostonMassachusettsMember
   
Operating Leases, Future Minimum Payments Due 6,600,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= fds_BostonMassachusettsMember
   
Hyderabad, India [Member]      
Note 16 - Commitments and Contingencies (Details) [Line Items]      
Operating Leases, Future Minimum Payments Due $ 2,200,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= fds_HyderabadIndiaMember