Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock at Cost [Member]	Treasury Stock Held for Deferred Compensation [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, 2017	$ 1,371,383	$ 106	$ (559,641)	$ (7,135)	$ 163,836	$ (27,280)	$ 135	$ (26,041)	$ (53,186)	$ 7,135	$ 1,820,268
Balance, Common Stock, shares at Sep. 30, 2017		72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2017			(11,739,000)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2017				(186,000)
Net earnings	180,378										180,378
Other comprehensive income (loss), net of tax	(21,756)					(12,514)	(21,077)	11,835	(21,756)
Cash dividends paid	(34,003)										(34,003)
Sales of treasury stock	9,132		$ 12,649		(3,517)
Sales of treasury stock, shares			334,000
Common shares issued from treasury stock for benefit plans	14,741		$ 7,584		7,157
Common shares issued from treasury stock for benefit plans, shares			202,000
Stock-based compensation	18,229				18,229
Purchases and transfers of stock by/to deferred compensation plan				$ (1,318)						1,318
Purchases and transfer of stock by/to deferred compensation plan, shares				(17,000)
Distribution of stock from deferred compensation plan				$ 22						(22)
Distribution of stock from deferred compensation plan, shares				1,000
Balances at Sep. 30, 2018	1,538,104	$ 106	$ (539,408)	$ (8,431)	185,705	(39,794)	(20,942)	(14,206)	(74,942)	8,431	1,966,643
Balance, Common Stock, shares at Sep. 30, 2018		72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2018			(11,203,000)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2018				(202,000)
Net earnings	259,602										259,602
Other comprehensive income (loss), net of tax	(28,319)					(13,396)	15,987	(30,910)	(28,319)
Cash dividends paid	(39,066)										(39,066)
Purchases of treasury stock	(110,311)		$ (110,311)
Purchases of treasury stock, shares			(1,102,000)
Sales of treasury stock	36,044		$ 41,948		(5,904)
Sales of treasury stock, shares			1,107,000
Common shares issued from treasury stock for benefit plans	14,846		$ 5,673		9,173
Common shares issued from treasury stock for benefit plans, shares			158,000
Stock-based compensation	18,146				18,146
Purchases and transfers of stock by/to deferred compensation plan				$ (1,193)						1,193
Purchases and transfer of stock by/to deferred compensation plan, shares				(14,000)
Distribution of stock from deferred compensation plan				$ 242						(242)
Distribution of stock from deferred compensation plan, shares				5,000
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	72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2019	(11,040,000)		(11,040,000)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2019	(211,000)			(211,000)
Cumulative effect from adoption of ASC 606 | Accounting Standards Update 2014-09	$ 38,700					(45)			(45)		38,745
Cumulative effect from adoption of ASC 606 | Cumulative Effect From Adoption Of A S U201616	(1,005)										(1,005)
Net earnings	240,395										240,395
Other comprehensive income (loss), net of tax	13,512					12,544	(15,502)	16,470	13,512
Cash dividends paid	(37,664)										(37,664)
Purchases of treasury stock	(13,346)		$ (13,346)
Purchases of treasury stock, shares			(124,000)
Sales of treasury stock	25,134		$ 32,640		(7,506)
Sales of treasury stock, shares			763,000
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	22,902				22,902
Purchases and transfers of stock by/to deferred compensation plan				$ (681)						681
Purchases and transfer of stock by/to deferred compensation plan, shares				(6,000)
Distribution of stock from deferred compensation plan				$ 841						(841)
Distribution of stock from deferred compensation plan, shares				18,000
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)
Cumulative effect from adoption of ASC 606 | Accounting Standards Update 2016-02	$ 255										$ 255