Note 13. Employee Stock Option and Retirement Plans (Detail) - Summary of Restricted Stock Award (USD $)	3 Months Ended
	Nov. 30, 2012
Balance	383,000
Balance (in Dollars per share)	$ 71.34
Vested*	(92,715)	[1]
Vested* (in Dollars per share)	$ 63.23	[1]
Canceled/forfeited	(1,000)
Canceled/forfeited (in Dollars per share)	$ 77.38
Balance	289,000
Balance (in Dollars per share)	$ 73.92

[1] Of the total 92,715 restricted stock awards that vested during the first quarter of fiscal 2013, 87,758 related to awards granted on October 23, 2009 at the grant date price of $66.46. These restricted stock awards cliff vest 60% after three years (on October 23, 2012) and the remaining 40% after five years (October 23, 2014). The awards are amortized to expense over the vesting period using the straight-line attribution method. As of November 30, 2012, unamortized stock-based compensation expense of $3.2 million is to be amortized to compensation expense over the remaining vesting period of 1.9 years. The remaining 4,957 restricted stock awards that vested during the first quarter of fiscal 2013 were previously granted between June 2010 and July 2011. These restricted stock units were performance-based and cliff vest 25% when certain ASV targets are met. Of the total units originally granted, 14,258 units vested during the fourth quarter of fiscal 2012 and the remaining 4,957 vested during the first quarter of fiscal 2013 because FactSet achieved all four ASV growth targets. As of November 30, 2012, there is no remaining unamortized stock-based compensation expense as all units vested.