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
Beginning balance, shares at Aug. 31, 2023			8,083
Net earnings	53,521	$ 0	$ 0	0	53,521	0
Other comprehensive loss	(3,992)	0	0	0	0	(3,992)
Total comprehensive income	49,529	0	0	0	0	0
Cash dividends per share	(11,557)	0	0	0	(11,557)	0
Repurchase of common stock	(17,900)	$ 0	$ (17,900)	0	0	0
Repurchase of common stock, shares		0	154
Issuance of common shares under share compensation plans, net	(614)	$ 29	$ 0	(643)	0	0
Issuance of common shares under share compensation plans, net, shares		29	0
Share-based compensation expense	4,887	$ 0	$ 0	4,887	0	0
Ending balance, value at May. 31, 2024	479,996	$ 19,123	$ (295,138)	102,752	678,261	(25,002)
Ending Balance, shares at May. 31, 2024		19,123
Ending Balance, shares at May. 31, 2024			8,237
Beginning balance, value at Feb. 29, 2024	483,034	$ 19,122	$ (277,238)	101,060	661,715	(21,625)
Beginning balance, shares at Feb. 29, 2024		19,122
Beginning balance, shares at Feb. 29, 2024			8,083
Net earnings	20,379	$ 0	$ 0	0	20,379	0
Other comprehensive loss	(3,377)	0	0	0	0	(3,377)
Total comprehensive income	17,002	0	0	0	0	0
Cash dividends per share	(3,833)	0	0	0	(3,833)	0
Repurchase of common stock	(17,900)	$ 0	$ (17,900)	0	0	0
Repurchase of common stock, shares		0	154
Issuance of common shares under share compensation plans, net	141	$ 1	$ 0	140	0	0
Issuance of common shares under share compensation plans, net, shares		1	0
Share-based compensation expense	1,552	$ 0	$ 0	1,552	0	0
Ending balance, value at May. 31, 2024	479,996	$ 19,123	$ (295,138)	102,752	678,261	(25,002)
Ending Balance, shares at May. 31, 2024		19,123
Ending Balance, shares at May. 31, 2024			8,237
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
Beginning balance, shares at Aug. 31, 2024			8,277
Net earnings	63,239	$ 0	$ 0	0	63,239	0
Other comprehensive loss	(7,139)	0	0	0	0	(7,139)
Total comprehensive income	56,100	0	0	0	0	0
Cash dividends per share	(11,734)	0	0	0	(11,734)	0
Repurchase of common stock	(2,675)	$ 0	$ (2,675)	0	0	0
Repurchase of common stock, shares		0	23
Issuance of common shares under share compensation plans, net	221	$ 38	$ 0	183	0	0
Issuance of common shares under share compensation plans, net, shares		38	0
Share-based compensation expense	5,971	$ 0	$ 0	5,971	0	0
Ending balance, value at May. 31, 2025	528,776	$ 19,162	$ (302,367)	110,523	738,598	(37,140)
Ending Balance, shares at May. 31, 2025		19,162
Ending Balance, shares at May. 31, 2025			8,300
Beginning balance, value at Feb. 28, 2025	516,419	$ 19,155	$ (301,119)	107,869	723,008	(32,494)
Beginning balance, shares at Feb. 28, 2025		19,155
Beginning balance, shares at Feb. 28, 2025			8,289
Net earnings	19,500	$ 0	$ 0	0	19,500	0
Other comprehensive loss	(4,646)	0	0	0	0	(4,646)
Total comprehensive income	14,854	0	0	0	0
Cash dividends per share	(3,910)	0	0	0	(3,910)	0
Repurchase of common stock	(1,248)	$ 0	$ (1,248)	0	0	0
Repurchase of common stock, shares		0	11
Issuance of common shares under share compensation plans, net	644	$ 7	$ 0	637	0	0
Issuance of common shares under share compensation plans, net, shares		7	0
Share-based compensation expense	2,017	$ 0	$ 0	2,017	0	0
Ending balance, value at May. 31, 2025	$ 528,776	$ 19,162	$ (302,367)	$ 110,523	$ 738,598	$ (37,140)
Ending Balance, shares at May. 31, 2025		19,162
Ending Balance, shares at May. 31, 2025			8,300