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Document And Entity Information
3 Months Ended
Nov. 30, 2014
Dec. 31, 2014
Document and Entity Information [Abstract]    
Entity Registrant Name FACTSET RESEARCH SYSTEMS INC  
Document Type 10-Q  
Current Fiscal Year End Date --08-31  
Entity Common Stock, Shares Outstanding   41,707,175dei_EntityCommonStockSharesOutstanding
Amendment Flag false  
Entity Central Index Key 0001013237  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Large Accelerated Filer  
Entity Well-known Seasoned Issuer Yes  
Document Period End Date Nov. 30, 2014  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1