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, 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
Purchase of treasury stock (in shares)							48,000
Purchase of treasury stock	(4,548)						(4,548)
Issuance of treasury stock (in shares)	0
Issuance of restricted stock (in shares)		16,000
Forfeiture of restricted stock awards (in shares)		(1,000)
Exercise of stock options (in shares)		5,000
Proceeds from exercise of stock options	118		118
Stock-based compensation	4,666		3,321	1,345
Dividend paid to stockholders	(10,570)					(10,570)
Dividend payable to stockholders	(10,593)					(10,593)
Net income	49,710					49,710
Other Comprehensive Income (Loss)	(11,439)				(11,439)
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
Balance at Aug. 31, 2014	548,265	3	397,150	9,505	(49,286)	215,613	(24,720)
Balance (in shares) at Aug. 31, 2014		30,951,000					741,000
Purchase of treasury stock (in shares)							50,000
Purchase of treasury stock	(4,441)						(4,441)
Issuance of treasury stock (in shares)	0
Issuance of restricted stock (in shares)		20,000
Forfeiture of restricted stock awards (in shares)		0
Exercise of stock options (in shares)		3,000
Proceeds from exercise of stock options	49		49
Stock-based compensation	4,797		3,340	1,457
Dividend paid to stockholders	(10,564)					(10,564)
Dividend payable to stockholders	(10,564)					(10,564)
Net income	45,482					45,482
Other Comprehensive Income (Loss)	(19,113)				(19,113)
Balance at Feb. 28, 2015	$ 553,911	$ 3	$ 400,539	$ 10,962	$ (68,399)	$ 239,967	$ (29,161)
Balance (in shares) at Feb. 28, 2015		30,974,000					791,000