CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock, Common [Member]	Total
Beginning balance at Sep. 30, 2020	$ 306,000	$ 293,682,000	$ 775,829,000	$ (3,657,000)	$ (107,134,000)	$ 959,026,000
Beginning Balance (in shares) at Sep. 30, 2020	30,646
Comprehensive income (loss):
Net earnings	$ 0	0	63,496,000	0	0	63,496,000
Translation adjustments, net of tax of $0	0	0	0	1,496,000	0	1,496,000
Cash dividends declared ($0.32 per share)	0	0	(8,336,000)	0	0	(8,336,000)
Stock compensation plans, net of tax of $0	$ 1,000	3,962,000	0	0	51,000	4,014,000
Stock compensation plans, net of tax of $0 (in shares)	20
Ending balance at Sep. 30, 2021	$ 307,000	297,644,000	830,989,000	(2,161,000)	(107,083,000)	1,019,696,000
Ending Balance (in shares) at Sep. 30, 2021	30,666
Comprehensive income (loss):
Net earnings	$ 0	0	82,320,000	0	0	82,320,000
Net unrecognized actuarial loss - SERP	0	0	0	(727,000)	0	(727,000)
Translation adjustments, net of tax of $0	0	0	0	(28,876,000)	0	(28,876,000)
Cash dividends declared ($0.32 per share)	0	0	(8,287,000)	0	0	(8,287,000)
Purchases of common stock into treasury	0	0	0	0	(19,878,000)	(19,878,000)
Stock compensation plans, net of tax of $0	$ 0	3,909,000	0	0	0	3,909,000
Stock compensation plans, net of tax of $0 (in shares)	42
Ending balance at Sep. 30, 2022	$ 307,000	301,553,000	905,022,000	(31,764,000)	(126,961,000)	1,048,157,000
Ending Balance (in shares) at Sep. 30, 2022	30,708
Comprehensive income (loss):
Net earnings	$ 0	0	92,545,000	0	0	92,545,000
Translation adjustments, net of tax of $0	0	0	0	7,795,000	0	7,795,000
Cash dividends declared ($0.32 per share)	0	0	(8,252,000)	0	0	(8,252,000)
Purchases of common stock into treasury	0	0	0	0	(12,401,000)	(12,401,000)
Stock compensation plans, net of tax of $0	$ 1,000	3,297,000	0	0	0	3,298,000
Stock compensation plans, net of tax of $0 (in shares)	74
Ending balance at Sep. 30, 2023	$ 308,000	$ 304,850,000	$ 989,315,000	$ (23,969,000)	$ (139,362,000)	$ 1,131,142,000
Ending Balance (in shares) at Sep. 30, 2023	30,782