CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Beginning balance at Aug. 31, 2019	$ 20	$ 155,132	$ 374,060	$ (32,482)	$ (351,255)	$ 145,475
Beginning balance, shares at Aug. 31, 2019	19,773,977				6,055,316
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes		(2,640)				(2,640)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares	38,708
Stock-based compensation		5,358				5,358
Cash dividends			(36,039)			(36,039)
Repurchases of common stock					$ (16,825)	(16,825)
Repurchases of common stock, shares					92,583
Foreign currency translation adjustment				4,274		4,274
Net income			60,710			60,710
Ending balance at Aug. 31, 2020	$ 20	157,850	398,731	(28,208)	$ (368,080)	160,313
Ending balance, shares at Aug. 31, 2020	19,812,685				6,147,899
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes		(3,668)				(3,668)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares	44,180
Stock-based compensation		9,555				9,555
Cash dividends			(38,225)			(38,225)
Foreign currency translation adjustment				2,178		2,178
Net income			70,229			70,229
Ending balance at Aug. 31, 2021	$ 20	163,737	430,735	(26,030)	$ (368,080)	$ 200,382
Ending balance, shares at Aug. 31, 2021	19,856,865				6,147,899	13,708,966
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes		(4,461)				$ (4,461)
Issuance of common stock under share-based compensation plan, net of shares withheld for taxes, shares	31,942
Stock-based compensation		6,697				6,697
Cash dividends			(41,988)			(41,988)
Repurchases of common stock					$ (29,156)	(29,156)
Repurchases of common stock, shares					138,562
Foreign currency translation adjustment				(10,179)		(10,179)
Net income			67,329			67,329
Ending balance at Aug. 31, 2022	$ 20	$ 165,973	$ 456,076	$ (36,209)	$ (397,236)	$ 188,624
Ending balance, shares at Aug. 31, 2022	19,888,807				6,286,461	13,602,346