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 (Deficit), Beginning 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 (Deficit), Ending Balance at Aug. 31, 2014	1,183	225,004	801,202	$ (964,714)	62,675
Balance, shares at Aug. 31, 2014				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 (Deficit), 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
Net income			64,067		$ 64,067
Cash dividends			(21,340)		(21,340)
Stock-based compensation expense		3,766			3,766
Purchase of treasury stock				$ (148,345)	(148,345)
Purchase of treasury stock, shares				5,209
Exercise of stock options and issuance of restricted stock		(5,941)		$ 9,783	3,842
Exercise of stock options and issuance of restricted stock, shares				(767)
Other		4,581		$ 353	4,934
Other, shares				(21)
Stockholders' Equity (Deficit), Ending Balance at Aug. 31, 2016	$ 1,183	$ 234,956	$ 894,442	$ (1,206,224)	$ (75,643)
Balance, shares at Aug. 31, 2016				71,670	71,670