Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Total Accumulated Other Comprehensive (Loss) Earnings [Member]	Foreign Currency Translation Adjustments [Member]	Unrealized Derivative Gains (Losses) [Member]	Minimum Retirement Benefit Liability Adjustments [Member]	Deferred Compensation [Member]	Retained Earnings [Member]	Treasury Stock at Cost [Member]	Treasury Stock Held for Deferred Compensaton [Member]	Adjustments [Member]	Total
Balances at Sep. 30, 2016	$ 106	$ 141,570	$ (65,705)	$ (25,971)	$ 179	$ (39,913)	$ 5,089	$ 1,649,506	$ (512,882)	$ (5,089)		$ 1,212,595
Balance, Common Stock, shares at Sep. 30, 2016	72,960
Balance, Treasury Stock, shares at Sep. 30, 2016									(11,374)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2016										(157)
Net earnings								200,507				200,507
Other comprehensive earnings (loss), net of tax			12,519	(1,309)	(44)	13,872						12,519
Cash dividends paid								(29,745)				(29,745)
Purchases of treasury stock									$ (73,224)			(73,224)
Purchases of treasury stock, shares									(1,056)
Sales of treasury stock		(2,257)							$ 17,925			15,668
Sales of treasury stock, shares									466
Common shares issued from treasury stock for benefit plans		6,501							$ 7,513			$ 14,014
Common shares issued from treasury stock for benefit plans, shares									199			199
Common shares issued from treasury stock to settle employee liabilities		740					1,767		$ 1,027	$ (1,767)		$ 1,767
Common shares issued from treasury stock to settle employee liabilities, shares									26	(26)
Stock-based compensation		17,282										17,282
Purchases and transfers of stock by/to deferred compensation plan							298			$ (298)
Purchases and transfer of stock by/to deferred compensation plan, shares										(3)
Distribution of stock from deferred compensation plan							(19)			$ 19
Balances at Sep. 30, 2017	$ 106	163,836	(53,186)	(27,280)	135	(26,041)	7,135	1,820,268	$ (559,641)	$ (7,135)		1,371,383
Balance, Common Stock, shares at Sep. 30, 2017	72,960
Balance, Treasury Stock, shares at Sep. 30, 2017									(11,739)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2017										(186)
Net earnings								180,378				180,378
Other comprehensive earnings (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		(3,517)							$ 12,649			9,132
Sales of treasury stock, shares									334
Common shares issued from treasury stock for benefit plans		7,157							$ 7,584			$ 14,741
Common shares issued from treasury stock for benefit plans, shares									202			202
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)
Distribution of stock from deferred compensation plan							(22)			$ 22
Distribution of stock from deferred compensation plan, shares										1
Balances (ASC 606 [Member]) at Sep. 30, 2018											$ 38,700
Balances at Sep. 30, 2018	$ 106	185,705	(74,942)	(39,794)	(20,942)	(14,206)	8,431	1,966,643	$ (539,408)	$ (8,431)		$ 1,538,104
Balance, Common Stock, shares at Sep. 30, 2018	72,960											72,960
Balance, Treasury Stock, shares at Sep. 30, 2018									(11,203)			(11,203)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2018										(202)		(202)
Net earnings | ASC 606 [Member]											5,635
Net earnings								259,602				$ 259,602
Other comprehensive earnings (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)
Sales of treasury stock		(5,904)							$ 41,948			36,044
Sales of treasury stock, shares									1,107
Common shares issued from treasury stock for benefit plans		9,173							$ 5,673			$ 14,846
Common shares issued from treasury stock for benefit plans, shares									158			158
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)
Distribution of stock from deferred compensation plan							(242)			$ 242
Distribution of stock from deferred compensation plan, shares										5
Balances (ASC 606 [Member]) at Sep. 30, 2019											$ 43,935
Balances at Sep. 30, 2019	$ 106	$ 207,120	(103,306)	(53,235)	$ (4,955)	$ (45,116)	$ 9,382	2,224,919	$ (602,098)	$ (9,382)		$ 1,726,741
Balance, Common Stock, shares at Sep. 30, 2019	72,960											72,960
Balance, Treasury Stock, shares at Sep. 30, 2019									(11,040)			(11,040)
Balance, Treasury stock held for deferred compensation, shares at Sep. 30, 2019										(211)		(211)
Cumulative effect from adoption | ASC 606 [Member]			$ (45)	$ (45)				38,745				$ 38,700
Cumulative effect from adoption | ASU 2016-16 [Member]								$ (1,005)				$ (1,005)