Note 18 - Subsequent Events	9 Months Ended
May. 31, 2015
Subsequent Events [Abstract]
Subsequent Events [Text Block]	18. SUBSEQUENT EVENTS As previously disclosed in the Company’s Form 8-K filed with the SEC on July 2, 2015, FactSet’s Chairman and Chief Executive Officer (“CEO”), Philip Hadley, stepped down as CEO effective July 1, 2015. He will remain an employee of FactSet and continue to serve as the Company’s Chairman of the Board of Directors. The Company’s President, 19-year FactSet veteran Philip Snow, was named the Company’s new CEO, effective July 1, 2015.

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

No definition available.

Name:	us-gaap_SubsequentEventsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration