CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Tax Benefit From Stock Based Compensation [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Total
Balance at Aug. 31, 2016	$ 3	$ 412,369	$ 11,321	$ (103,951)	$ 351,060	$ (32,731)	$ 638,071
Balance (in shares) at Aug. 31, 2016	31,238,000					836,000
Issuance of restricted stock award
Issuance of restricted stock award (in shares)	5,000
Stock-based compensation		2,442					2,442
Net income					24,869		24,869
Other comprehensive income (loss)				(10,381)			(10,381)
Balance at Nov. 30, 2016	$ 3	414,811	11,321	(114,332)	375,929	$ (32,731)	655,001
Balance (in shares) at Nov. 30, 2016	31,243,000					836,000
Balance at Aug. 31, 2017	$ 3	422,395	11,486	(110,059)	420,866	$ (35,924)	$ 708,767
Balance (in shares) at Aug. 31, 2017	31,276,000					875,000	30,400,742
Issuance of restricted stock award
Issuance of restricted stock award (in shares)	3,000
Stock-based compensation		2,461					2,461
Net income					22,490		22,490
Other comprehensive income (loss)				(1,409)			(1,409)
Balance at Nov. 30, 2017	$ 3	$ 424,856	$ 11,486	$ (111,468)	$ 443,356	$ (35,924)	$ 732,309
Balance (in shares) at Nov. 30, 2017	31,279,000					875,000	30,403,610