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, 2015	$ 3	$ 403,168	$ 10,711	$ (101,512)	$ 283,611	$ (29,397)	$ 566,584
Balance (in shares) at Aug. 31, 2015	30,978,000					793,000
Issuance of restricted stock award
Issuance of restricted stock award (in shares)	186,000
Stock-based compensation		2,100					2,100
Net income					23,672		23,672
Other comprehensive income (loss)				(596)			(596)
Balance at Nov. 30, 2015	$ 3	405,268	10,711	(102,108)	307,283	$ (29,397)	591,760
Balance (in shares) at Nov. 30, 2015	31,164,000					793,000
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	30,401,307
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	30,406,433