Condensed 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, 2023	$ 455,651	$ 19,094	$ (277,238)	$ 98,508	$ 636,297	$ (21,010)
Beginning balance, shares at Aug. 31, 2023		19,094	8,083
Net earnings	33,142	$ 0	$ 0	0	33,142	0
Other comprehensive income (loss)	(615)	0	0	0	0	(615)
Total comprehensive income	32,527	0	0	0	0	0
Cash dividends per share	(7,724)	0	0	0	(7,724)	0
Repurchase of common stock	0	0	0	0	0	0
Issuance of common shares under share compensation plans, net	(755)	$ 28	$ 0	(783)	0	0
Issuance of common shares under share compensation plans, net, shares		28	0
Share-based compensation expense	3,335	$ 0	$ 0	3,335	0	0
Ending balance, value at Feb. 29, 2024	483,034	$ 19,122	$ (277,238)	101,060	661,715	(21,625)
Ending Balance, shares at Feb. 29, 2024		19,122	8,083
Beginning balance, value at Nov. 30, 2023	466,860	$ 19,115	$ (277,238)	98,628	647,455	(21,100)
Beginning balance, shares at Nov. 30, 2023		19,115	8,083
Net earnings	18,123	$ 0	$ 0	0	18,123	0
Other comprehensive income (loss)	(525)	0	0	0	0	(525)
Total comprehensive income	17,598	0	0	0	0	0
Cash dividends per share	(3,863)	$ 0	0	$ 0	$ (3,863)	$ 0
Repurchase of common stock	0		$ 0
Repurchase of common stock, shares		0	0	0	0	0
Issuance of common shares under share compensation plans, net	707	$ 7	$ 0	$ 700	$ 0	$ 0
Issuance of common shares under share compensation plans, net, shares		7	0
Share-based compensation expense	1,732	$ 0	$ 0	1,732	0	0
Ending balance, value at Feb. 29, 2024	483,034	$ 19,122	$ (277,238)	101,060	661,715	(21,625)
Ending Balance, shares at Feb. 29, 2024		19,122	8,083
Beginning balance, value at Aug. 31, 2024	480,893	$ 19,124	$ (299,692)	104,369	687,093	(30,001)
Beginning balance, shares at Aug. 31, 2024		19,124	8,277
Net earnings	43,739	$ 0	$ 0	0	43,739	0
Other comprehensive income (loss)	(2,493)	0	0	0	0	(2,493)
Total comprehensive income	41,246	0	0	0	0	0
Cash dividends per share	(7,824)	0	0	0	(7,824)	0
Repurchase of common stock	(1,427)	$ 0	$ (1,427)	0	0	0
Repurchase of common stock, shares		0	12
Issuance of common shares under share compensation plans, net	(423)	$ 31	$ 0	(454)	0	0
Issuance of common shares under share compensation plans, net, shares		31	0
Share-based compensation expense	3,954	$ 0	$ 0	3,954	0	0
Ending balance, value at Feb. 28, 2025	516,419	$ 19,155	$ (301,119)	107,869	723,008	(32,494)
Ending Balance, shares at Feb. 28, 2025		19,155	8,289
Beginning balance, value at Nov. 30, 2024	488,459	$ 19,145	$ (299,703)	104,995	700,345	(36,323)
Beginning balance, shares at Nov. 30, 2024		19,145	8,277
Net earnings	26,576	$ 0	$ 0	0	26,576	0
Other comprehensive income (loss)	(3,829)	0	0	0	0	(3,829)
Total comprehensive income	30,405	0	0	0	0
Cash dividends per share	(3,913)	0	0	0	(3,913)	0
Repurchase of common stock	(1,416)	$ 0	$ (1,416)	0	0	0
Repurchase of common stock, shares		0	12
Issuance of common shares under share compensation plans, net	907	$ 10	$ 0	897	0	0
Issuance of common shares under share compensation plans, net, shares		10	0
Share-based compensation expense	1,977	$ 0	$ 0	1,977	0	0
Ending balance, value at Feb. 28, 2025	$ 516,419	$ 19,155	$ (301,119)	$ 107,869	$ 723,008	$ (32,494)
Ending Balance, shares at Feb. 28, 2025		19,155	8,289