CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Beginning Balance at Sep. 30, 2018	$ 305,000	$ 291,190,000	$ 606,837,000	$ (31,528,000)	$ (107,394,000)	$ 759,410,000
Balance (in shares) at Sep. 30, 2018	30,535
Comprehensive income (loss):
Net earnings	$ 0	0	81,039,000	0	0	81,039,000
Translation adjustments, net of tax	0	0	0	(6,474,000)	0	(6,474,000)
Net unrecognized actuarial loss, net of tax	0	0	0	(6,066,000)	0	(6,066,000)
Forward exchange contracts, net of tax	0	0	0	94,000	0	94,000
Cash dividends declared	0	0	(8,302,000)	0	0	(8,302,000)
Adoption of new accounting standard ASU 2014-09	0	0	5,167,000	0	0	5,167,000
Stock compensation plans, net of tax	$ 1,000	1,218,000	0	0	135,000	1,354,000
Stock compensation plans, net of tax (in shares)	62
Ending Balance at Sep. 30, 2019	$ 306,000	292,408,000	684,741,000	(43,974,000)	(107,259,000)	826,222,000
Ending Balance (in shares) at Sep. 30, 2019	30,597
Comprehensive income (loss):
Net earnings	$ 0	0	99,411,000	0	0	99,411,000
Translation adjustments, net of tax	0	0	0	3,172,000	0	3,172,000
Cash dividends declared	0	0	(8,323,000)	0	0	(8,323,000)
Stock compensation plans, net of tax	$ 0	1,274,000	0	0	125,000	1,399,000
Stock compensation plans, net of tax (in shares)	49
Pension termination and net unrecognized actuarial loss, net of tax of $(1,161)	$ 0	0	0	37,145,000	0	37,145,000
Ending Balance at Sep. 30, 2020	$ 306,000	293,682,000	775,829,000	(3,657,000)	(107,134,000)	959,026,000
Ending 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	0	0	0	1,496,000	0	1,496,000
Cash dividends declared	0	0	(8,336,000)	0	0	(8,336,000)
Stock compensation plans, net of tax	$ 1,000	3,962,000	0	0	51,000	4,014,000
Stock compensation plans, net of tax (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