Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock at Cost [Member]	Treasury Stock Held for Deferred Compensaton [Member]	Additional Paid-in Capital [Member]	Foreign Currency Translation Adjustments [Member]	Unrealized Derivative Gains (Losses) [Member]	Minimum Retirement Benefit Liability Adjustments [Member]	Total Accumulated Other Comprehensive (Loss) Earnings [Member]	Deferred Compensation [Member]	Retained Earnings [Member]
Balances at Sep. 30, 2020	$ 1,992,677	$ 106	$ (577,476)	$ (9,222)	$ 231,936	$ (40,691)	$ (20,457)	$ (28,646)	$ (89,794)	$ 9,222	$ 2,427,905
Balance, Common Stock, shares at Sep. 30, 2020		72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2020			(10,277,000)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2020				(199,000)
Net earnings	41,570										41,570
Other comprehensive earnings (loss), net of tax	9,478					21,239	(11,038)	(723)	9,478
Cash dividends paid	(5,102)										(5,102)
Sales of treasury stock	11,370		$ 12,381		(1,011)
Sales of treasury stock, shares			285,000
Stock-based compensation	13,469				13,469
Purchases/transfers of stock by/to deferred compensation plan				$ (276)						276
Purchases and transfer of stock by/to deferred compensation plan, shares				(3,000)
Distribution of stock from deferred compensation plan				$ 13						(13)
Distribution of stock from deferred compensation plan, shares				1,000
Balances at Dec. 31, 2020	2,063,462	$ 106	$ (565,095)	$ (9,485)	244,394	(19,452)	(31,495)	(29,369)	(80,316)	9,485	2,464,373
Balance, Common Stock, shares at Dec. 31, 2020		72,960,000
Balance, Treasury Stock, shares at Dec. 31, 2020			(9,992,000)
Balance, Treasury stock held for deferred compensation, shares at Dec. 31, 2020				(201,000)
Balances at Sep. 30, 2021	$ 2,214,781	$ 106	$ (581,954)	$ (7,949)	261,735	(32,904)	(25,597)	(7,118)	(65,619)	7,949	2,600,513
Balance, Common Stock, shares at Sep. 30, 2021	72,960,000	72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2021	(9,702,000)		(9,702,000)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2021	(167,000)			(167,000)
Net earnings	$ 30,305										30,305
Other comprehensive earnings (loss), net of tax	215					(2,353)	2,214	354	215
Cash dividends paid	(10,247)										(10,247)
Sales of treasury stock	3,228		$ 2,489		739
Sales of treasury stock, shares			58,000
Purchases of treasury stock	(26,742)		$ (26,742)
Purchases of treasury stock, shares			(233,000)
Stock-based compensation	11,892				11,892
Purchases/transfers of stock by/to deferred compensation plan				$ (47)						47
Purchases and transfer of stock by/to deferred compensation plan, shares				(1,000)
Distribution of stock from deferred compensation plan				$ 36						(36)
Distribution of stock from deferred compensation plan, shares				1,000
Balances at Dec. 31, 2021	$ 2,223,432	$ 106	$ (606,207)	$ (7,960)	$ 274,366	$ (35,257)	$ (23,383)	$ (6,764)	$ (65,404)	$ 7,960	$ 2,620,571
Balance, Common Stock, shares at Dec. 31, 2021	72,960,000	72,960,000
Balance, Treasury Stock, shares at Dec. 31, 2021	(9,877,000)		(9,877,000)
Balance, Treasury stock held for deferred compensation, shares at Dec. 31, 2021	(167,000)			(167,000)