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 Income (Loss)	15,019	$ 0	$ 0	0	15,019	0
Other comprehensive loss	(90)	0	0	0	0	(90)
Total comprehensive income	14,929	0	0	0	0	0
Cash dividends per share	(3,861)	0	0	0	(3,861)	0
Repurchase of common stock	0	$ 0	$ 0	0	0	0
Repurchase of common stock, shares		0	0
Issuance of common shares under share compensation plans, net	(1,462)	$ 21	$ 0	(1,483)	0	0
Issuance of common shares under share compensation plans, net, shares		21	0
Share-based compensation expense	1,603	$ 0	$ 0	1,603	0	0
Ending balance, value at Nov. 30, 2023	466,860	$ 19,115	$ (277,238)	98,628	647,455	(21,100)
Ending Balance, shares at Nov. 30, 2023		19,115	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 Income (Loss)	17,164	$ 0	$ 0	0	17,164	0
Other comprehensive loss	(6,322)	0	0	0	0	(6,322)
Total comprehensive income	10,842	0	0	0	0	0
Cash dividends per share	(3,912)	0	0	0	(3,912)	0
Repurchase of common stock	(11)	$ 0	$ (11)	0	0	0
Repurchase of common stock, shares		0	0
Issuance of common shares under share compensation plans, net	(1,330)	$ 21	$ 0	(1,351)	0	0
Issuance of common shares under share compensation plans, net, shares		21	0
Share-based compensation expense	1,977	$ 0	$ 0	1,977	0	0
Ending balance, value at Nov. 30, 2024	$ 488,459	$ 19,145	$ (299,703)	$ 104,995	$ 700,345	$ (36,323)
Ending Balance, shares at Nov. 30, 2024		19,145	8,277