Consolidated Statements Of Changes In 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, shares at Aug. 31, 2021	27,056,000				12,889,000
Beginning balance at Aug. 31, 2021	$ 1,353	$ 214,888	$ 63,591	$ 709	$ (200,678)
Issuance of common stock from treasury, shares					258,000
Issuance of common stock from treasury		(2,719)			$ 4,055
Purchases of treasury shares, shares					(585,000)	(585,536)
Purchases of treasury shares					$ (23,850)	$ (23,850)
Stock-based compensation		8,286
Unvested share award, shares					13,000
Unvested share award		(209)			$ 209
Cumulative translation adjustments				(1,251)		(1,251)
Net income			18,430			$ 18,430
Ending balance, shares at Aug. 31, 2022	27,056,000				13,203,000
Ending balance at Aug. 31, 2022	$ 1,353	220,246	82,021	(542)	$ (220,264)
Issuance of common stock from treasury, shares					98,000
Issuance of common stock from treasury		(127)			$ 1,666
Purchases of treasury shares, shares					(885,000)	(885,512)
Purchases of treasury shares					$ (35,555)	$ (35,555)
Stock-based compensation		12,520
Unvested share award, shares					16,000
Unvested share award		(266)			$ 266
Cumulative translation adjustments				(445)		(445)
Net income			17,781			17,781
Ending balance, shares at Aug. 31, 2023	27,056,000				(13,974,000)
Ending balance at Aug. 31, 2023	$ 1,353	232,373	99,802	(987)	$ (253,887)	$ 78,654
Ending balance, shares, Treasury at Aug. 31, 2023						(13,974,000)
Issuance of common stock from treasury, shares					643,000	666,440
Issuance of common stock from treasury		(10,266)			$ 11,733
Purchases of treasury shares, shares					(776,000)	(776,234)
Purchases of treasury shares					$ (30,749)	$ (30,749)
Stock-based compensation		10,142
Unvested share award, shares					23,000
Unvested share award		(436)			$ 436
Cumulative translation adjustments				219		219
Net income			23,402			23,402
Ending balance, shares at Aug. 31, 2024	27,056,000				(14,084,000)
Ending balance at Aug. 31, 2024	$ 1,353	$ 231,813	$ 123,204	$ (768)	$ (272,467)	$ 83,135
Ending balance, shares, Treasury at Aug. 31, 2024						(14,084,000)