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, 2019	$ 1,726,741	$ 106	$ (602,098)	$ (9,382)	$ 207,120	$ (53,235)	$ (4,955)	$ (45,116)	$ (103,306)	$ 9,382	$ 2,224,919
Balance, Common Stock, shares at Sep. 30, 2019		72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2019			(11,040,000)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2019				(211,000)
Net earnings	183,156										183,156
Other comprehensive earnings (loss), net of tax	(4,079)					4,245	(10,009)	1,685	(4,079)
Cash dividends paid	(32,587)										(32,587)
Purchases of treasury stock	(13,346)		$ (13,346)
Purchases of treasury stock, shares			(124,000)
Sales of treasury stock	14,790		$ 18,124		(3,334)
Sales of treasury stock, shares			430,000
Common shares issued from treasury stock for benefit plans	14,748		$ 5,328		9,420
Common shares issued from treasury stock for benefit plans, shares			124,000
Stock-based compensation	20,088				20,088
Purchases/transfers of stock by/to deferred compensation plan				$ (651)						651
Purchases and transfer of stock by/to deferred compensation plan, shares				(6,000)
Distribution of stock from deferred compensation plan				$ 273						(273)
Distribution of stock from deferred compensation plan, shares				6,000
Balances at Jun. 30, 2020	1,909,766	$ 106	$ (591,992)	$ (9,760)	233,294	(48,990)	(14,964)	(43,431)	(107,385)	9,760	2,375,743
Balance, Common Stock, shares at Jun. 30, 2020		72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2020			(10,610,000)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2020				(211,000)
Balances at Mar. 31, 2020	1,907,694	$ 106	$ (594,870)	$ (9,963)	227,494	(56,042)	32,671	(44,005)	(67,376)	9,963	2,342,340
Balance, Common Stock, shares at Mar. 31, 2020		72,960,000
Balance, Treasury Stock, shares at Mar. 31, 2020			(10,677,000)
Balance, Treasury stock held for deferred compensation, shares at Mar. 31, 2020				(216,000)
Net earnings	38,465										38,465
Other comprehensive earnings (loss), net of tax	(40,009)					7,052	(47,635)	574	(40,009)
Cash dividends paid	(5,062)										(5,062)
Sales of treasury stock	2,065		$ 2,878		(813)
Sales of treasury stock, shares			67,000
Common shares issued from treasury stock for benefit plans	14,748
Common shares issued from treasury stock for benefit plans, shares			124,000
Stock-based compensation	6,613				6,613
Purchases/transfers of stock by/to deferred compensation plan				$ (27)						27
Purchases and transfer of stock by/to deferred compensation plan, shares				5,000
Distribution of stock from deferred compensation plan				$ 230						(230)
Balances at Jun. 30, 2020	1,909,766	$ 106	$ (591,992)	$ (9,760)	233,294	(48,990)	(14,964)	(43,431)	(107,385)	9,760	2,375,743
Balance, Common Stock, shares at Jun. 30, 2020		72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2020			(10,610,000)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2020				(211,000)
Cumulative effect from adoption | ASC 842 [Member]	255										255
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	72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2020	(10,277,000)		(10,277,000)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2020	(199,000)			(199,000)
Net earnings	$ 158,744										158,744
Other comprehensive earnings (loss), net of tax	9,828					15,547	(6,008)	289	9,828
Cash dividends paid	(25,734)										(25,734)
Sales of treasury stock	32,219		$ 33,326		(1,107)
Sales of treasury stock, shares			788,000
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	19,053				19,053
Purchases/transfers of stock by/to deferred compensation plan				$ (357)						357
Purchases and transfer of stock by/to deferred compensation plan, shares				(3,000)
Distribution of stock from deferred compensation plan				$ 1,429						(1,429)
Distribution of stock from deferred compensation plan, shares				29,000
Balances at Jun. 30, 2021	$ 2,201,687	$ 106	$ (538,792)	$ (8,150)	259,424	(25,144)	(26,465)	(28,357)	(79,966)	8,150	2,560,915
Balance, Common Stock, shares at Jun. 30, 2021	72,960,000	72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2021	(9,361,000)		(9,361,000)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2021	(173,000)			(173,000)
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)
Net earnings	48,861										48,861
Other comprehensive earnings (loss), net of tax	23,475					7,981	15,278	216	23,475
Cash dividends paid	(10,330)										(10,330)
Sales of treasury stock	3,765		$ 3,962		(197)
Sales of treasury stock, shares			93,000
Common shares issued from treasury stock for benefit plans	14,900
Common shares issued from treasury stock for benefit plans, shares			128,000
Stock-based compensation	2,615				2,615
Purchases/transfers of stock by/to deferred compensation plan				$ (40)						40
Distribution of stock from deferred compensation plan				$ 993						(993)
Distribution of stock from deferred compensation plan, shares				19,000
Balances at Jun. 30, 2021	$ 2,201,687	$ 106	$ (538,792)	$ (8,150)	$ 259,424	$ (25,144)	$ (26,465)	$ (28,357)	$ (79,966)	$ 8,150	$ 2,560,915
Balance, Common Stock, shares at Jun. 30, 2021	72,960,000	72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2021	(9,361,000)		(9,361,000)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2021	(173,000)			(173,000)