Consolidated Statements Of Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Stockholders' Equity, Beginning Balance at Aug. 31, 2012	$ 1,183	$ 230,543	$ 722,614	$ (895,093)	$ 59,247
Balance, shares at Aug. 31, 2012				60,325
Net income			36,701		36,701
Stock-based compensation expense		3,630			3,630
Purchase of treasury stock				$ (35,480)	(35,480)
Purchase of treasury stock, shares				3,332
Exercise of stock options and issuance of restricted stock		(6,127)	(1,057)	$ 23,527	16,343
Exercise of stock options and issuance of restricted stock, shares				(1,607)
Other		(3,278)	(120)	$ 421	(2,977)
Other, shares				(25)
Stockholders' Equity, Ending Balance at Aug. 31, 2013	1,183	224,768	758,138	$ (906,625)	77,464
Balance, shares at Aug. 31, 2013				62,025
Net income			47,916		47,916
Cash dividends			(4,852)		(4,852)
Stock-based compensation expense		3,742			3,742
Purchase of treasury stock				$ (80,045)	(80,045)
Purchase of treasury stock, shares				4,080
Exercise of stock options and issuance of restricted stock		(4,186)		$ 21,593	17,407
Exercise of stock options and issuance of restricted stock, shares				(1,575)
Other		680		$ 363	1,043
Other, shares				(25)
Stockholders' Equity, Ending Balance at Aug. 31, 2014	1,183	225,004	801,202	$ (964,714)	$ 62,675
Balance, shares at Aug. 31, 2014				64,505	64,505
Net income			64,485		$ 64,485
Cash dividends			(13,972)		(13,972)
Stock-based compensation expense		3,520			3,520
Purchase of treasury stock				$ (123,786)	(123,786)
Purchase of treasury stock, shares				4,201
Exercise of stock options and issuance of restricted stock		(1,458)		$ 20,190	18,732
Exercise of stock options and issuance of restricted stock, shares				(1,438)
Other		5,484		$ 295	5,779
Other, shares				(19)
Stockholders' Equity, Ending Balance at Aug. 31, 2015	$ 1,183	$ 232,550	$ 851,715	$ (1,068,015)	$ 17,433
Balance, shares at Aug. 31, 2015				67,249	67,249