CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Tax benefit from stock-based compensation [Member]	Accumulated other comprehensive loss [Member]	Retained Earnings (Accumulated deficit) [Member]	Treasury Stock [Member]
Balance at Aug. 31, 2012	$ 418,914	$ 3	$ 384,154	$ 6,680	$ (33,182)	$ 77,739	$ (16,480)
Balance (in shares) at Aug. 31, 2012		30,856,000					645,000
Treasury Stock, Shares, Acquired							42,000
Treasury Stock, Value, Acquired, Cost Method	(3,235)						(3,235)
Issuance of treasury stock (in shares)	0
Issuance of restricted stock award (in shares)		12,000
Forfeiture of restricted stock awards (in shares)		(1,000)
Stock-based compensation	4,320		3,491	829
Payments of Dividends	(9,065)					(9,065)
Dividends payable to stockholders	(9,065)					(9,065)
Net income	44,887					44,887
Other Comprehensive Income (Loss)	(3,622)				(3,622)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		3,000
Proceeds from Stock Options Exercised	47		47
Balance at Feb. 28, 2013	443,181	3	387,692	7,509	(36,804)	104,496	(19,715)
Balance (in shares) at Feb. 28, 2013		30,870,000					687,000
Balance at Aug. 31, 2012					(33,182)
Other Comprehensive Income (Loss)					(8,293)
Balance at Aug. 31, 2013	481,049	3	390,581	8,016	(41,475)	143,871	(19,947)
Balance (in shares) at Aug. 31, 2013		30,924,000					690,000
Treasury Stock, Shares, Acquired							48,000
Treasury Stock, Value, Acquired, Cost Method	(4,548)						(4,548)
Issuance of treasury stock (in shares)	0
Issuance of restricted stock award (in shares)		16,000
Forfeiture of restricted stock awards (in shares)		(1,000)
Stock-based compensation	4,666		3,321	1,345
Payments of Dividends	(10,570)					(10,570)
Dividends payable to stockholders	(10,593)					(10,593)
Net income	49,710					49,710
Other Comprehensive Income (Loss)	(11,439)				(11,439)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		5,000
Proceeds from Stock Options Exercised	118		118
Balance at Feb. 28, 2014	$ 498,393	$ 3	$ 394,020	$ 9,361	$ (52,914)	$ 172,418	$ (24,495)
Balance (in shares) at Feb. 28, 2014		30,944,000					738,000