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	109,883										109,883
Other comprehensive earnings (loss), net of tax	(13,647)					7,566	(21,286)	73	(13,647)
Cash dividends paid	(15,404)										(15,404)
Sales of treasury stock	28,454		$ 29,364		(910)
Sales of treasury stock, shares			695,000
Common shares issued from treasury stock for benefit plans	14,900		$ 5,358		9,542
Common shares issued from treasury stock for benefit plans, shares			128,000
Stock-based compensation	16,438				16,438
Purchases/transfers of stock by/to deferred compensation plan				$ (317)						317
Purchases and transfer of stock by/to deferred compensation plan, shares				(3,000)
Distribution of stock from deferred compensation plan				$ 436						(436)
Distribution of stock from deferred compensation plan, shares				10,000
Balances at Mar. 31, 2021	2,133,301	$ 106	$ (542,754)	$ (9,103)	257,006	(33,125)	(41,743)	(28,573)	(103,441)	9,103	2,522,384
Balance, Common Stock, shares at Mar. 31, 2021		72,960,000
Balance, Treasury Stock, shares at Mar. 31, 2021			(9,454,000)
Balance, Treasury stock held for deferred compensation, shares at Mar. 31, 2021				(192,000)
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)
Net earnings	68,313										68,313
Other comprehensive earnings (loss), net of tax	(23,125)					(13,673)	(10,248)	796	(23,125)
Cash dividends paid	(10,302)										(10,302)
Sales of treasury stock	17,084		$ 16,983		101
Sales of treasury stock, shares			410,000
Common shares issued from treasury stock for benefit plans	14,900		$ 5,358		9,542
Common shares issued from treasury stock for benefit plans, shares			128,000
Stock-based compensation	2,969				2,969
Purchases/transfers of stock by/to deferred compensation plan				$ (41)						41
Distribution of stock from deferred compensation plan				$ 423						(423)
Distribution of stock from deferred compensation plan, shares				9,000
Balances at Mar. 31, 2021	2,133,301	$ 106	$ (542,754)	$ (9,103)	257,006	(33,125)	(41,743)	(28,573)	(103,441)	9,103	2,522,384
Balance, Common Stock, shares at Mar. 31, 2021		72,960,000
Balance, Treasury Stock, shares at Mar. 31, 2021			(9,454,000)
Balance, Treasury stock held for deferred compensation, shares at Mar. 31, 2021				(192,000)
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	$ 78,211										78,211
Other comprehensive earnings (loss), net of tax	2,482					(6,764)	8,154	1,092	2,482
Cash dividends paid	(22,134)										(22,134)
Sales of treasury stock	19,513		$ 18,040		1,473
Sales of treasury stock, shares			405,000
Common shares issued from treasury stock for benefit plans	17,168		$ 6,567		10,601
Common shares issued from treasury stock for benefit plans, shares			150,000
Purchases of treasury stock	(272,099)		$ (272,099)
Purchases of treasury stock, shares			(2,280,000)
Stock-based compensation	13,957				13,957
Purchases/transfers of stock by/to deferred compensation plan				$ (115)						115
Purchases and transfer of stock by/to deferred compensation plan, shares				(2,000)
Distribution of stock from deferred compensation plan				$ 1,386						(1,386)
Distribution of stock from deferred compensation plan, shares				29,000
Balances at Mar. 31, 2022	$ 2,051,879	$ 106	$ (829,446)	$ (6,678)	287,766	(39,668)	(17,443)	(6,026)	(63,137)	6,678	2,656,590
Balance, Common Stock, shares at Mar. 31, 2022	72,960,000	72,960,000
Balance, Treasury Stock, shares at Mar. 31, 2022	(11,427,000)		(11,427,000)
Balance, Treasury stock held for deferred compensation, shares at Mar. 31, 2022	(140,000)			(140,000)
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
Balance, Treasury Stock, shares at Dec. 31, 2021			(9,877,000)
Balance, Treasury stock held for deferred compensation, shares at Dec. 31, 2021				(167,000)
Net earnings	47,906										47,906
Other comprehensive earnings (loss), net of tax	2,267					(4,411)	5,940	738	2,267
Cash dividends paid	(11,887)										(11,887)
Sales of treasury stock	16,285		$ 15,551		734
Sales of treasury stock, shares			347,000
Common shares issued from treasury stock for benefit plans	17,168		$ 6,567		10,601
Common shares issued from treasury stock for benefit plans, shares			150,000
Purchases of treasury stock	(245,357)		$ (245,357)
Purchases of treasury stock, shares			(2,047,000)
Stock-based compensation	2,065				2,065
Purchases/transfers of stock by/to deferred compensation plan				$ (68)						68
Purchases and transfer of stock by/to deferred compensation plan, shares				(1,000)
Distribution of stock from deferred compensation plan				$ 1,350						(1,350)
Distribution of stock from deferred compensation plan, shares				28,000
Balances at Mar. 31, 2022	$ 2,051,879	$ 106	$ (829,446)	$ (6,678)	$ 287,766	$ (39,668)	$ (17,443)	$ (6,026)	$ (63,137)	$ 6,678	$ 2,656,590
Balance, Common Stock, shares at Mar. 31, 2022	72,960,000	72,960,000
Balance, Treasury Stock, shares at Mar. 31, 2022	(11,427,000)		(11,427,000)
Balance, Treasury stock held for deferred compensation, shares at Mar. 31, 2022	(140,000)			(140,000)