Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Capital In Excess Of Stated Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net [Member]
Beginning balance, value at Aug. 31, 2022	$ 393,358	$ 19,063	$ (277,238)	$ 94,006	$ 579,000	$ (21,473)
Beginning balance, shares at Aug. 31, 2022		19,063
Beginning balance, shares at Aug. 31, 2022			8,083
Net earnings	72,379				72,379
Other comprehensive income (loss)	463					463
Total comprehensive income	72,842
Cash dividends per share	(15,082)				(15,082)
Issuance of common shares under share compensation plans, net	(1,996)	$ 31		(2,027)
Issuance of common shares under share compensation plans, net, shares		31
Share-based compensation expense	6,529			6,529
Ending balance, value at Aug. 31, 2023	455,651	$ 19,094	$ (277,238)	98,508	636,297	(21,010)
Ending Balance, shares at Aug. 31, 2023		19,094
Ending Balance, shares at Aug. 31, 2023			8,083
Net earnings	66,257				66,257
Other comprehensive income (loss)	(8,991)					(8,991)
Total comprehensive income	57,266
Cash dividends per share	(15,461)				(15,461)
Repurchase of common stock	(22,454)		$ (22,454)
Repurchase of common stock, shares			194
Issuance of common shares under share compensation plans, net	(501)	$ 30		(531)
Issuance of common shares under share compensation plans, net, shares		30
Share-based compensation expense	6,392			6,392
Ending balance, value at Aug. 31, 2024	480,893	$ 19,124	$ (299,692)	104,369	687,093	(30,001)
Ending Balance, shares at Aug. 31, 2024		19,124
Ending Balance, shares at Aug. 31, 2024			8,277
Net earnings	74,052				74,052
Other comprehensive income (loss)	(3,531)					(3,531)
Total comprehensive income	70,521
Cash dividends per share	(15,748)				(15,748)
Repurchase of common stock	(11,532)		$ (11,532)
Repurchase of common stock, shares			86
Issuance of common shares under share compensation plans, net	657	$ 43		614
Issuance of common shares under share compensation plans, net, shares		43
Share-based compensation expense	8,059			8,059
Ending balance, value at Aug. 31, 2025	$ 532,850	$ 19,167	$ (311,224)	$ 113,042	$ 745,397	$ (33,532)
Ending Balance, shares at Aug. 31, 2025		19,167
Ending Balance, shares at Aug. 31, 2025			8,363