Condensed 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, 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								105,866				105,866
Other comprehensive earnings (loss), net of tax			(24,143)	(6,379)	(18,718)	954						(24,143)
Cash dividends paid								(25,206)				(25,206)
Sales of treasury stock		(2,471)							$ 9,573			7,102
Sales of treasury stock, shares									255
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
Stock-based compensation		16,292										16,292
Purchases and transfers of stock by/to deferred compensation plan							1,267			$ (1,267)
Purchases and transfer of stock by/to deferred compensation plan, shares										(17)
Distribution of stock from deferred compensation plan							(9)			$ 9
Distribution of stock from deferred compensation plan, shares										1
Balances at Jun. 30, 2018	$ 106	184,814	(77,329)	(33,659)	(18,583)	(25,087)	8,393	1,900,928	$ (542,484)	$ (8,393)		1,466,035
Balance, Common Stock, shares at Jun. 30, 2018	72,960
Balance, Treasury Stock, shares at Jun. 30, 2018									(11,282)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2018										(202)
Balances at Mar. 31, 2018	$ 106	185,598	(40,721)	(14,867)	112	(25,966)	8,222	1,860,595	$ (548,668)	$ (8,222)		1,456,910
Balance, Common Stock, shares at Mar. 31, 2018	72,960
Balance, Treasury Stock, shares at Mar. 31, 2018									(11,440)
Balance, Treasury stock held for deferred compensation, shares at Mar. 31, 2018										(200)
Net earnings								49,117				49,117
Other comprehensive earnings (loss), net of tax			(36,608)	(18,792)	(18,695)	879						(36,608)
Cash dividends paid								(8,784)				(8,784)
Sales of treasury stock		(2,642)							$ 6,184			3,542
Sales of treasury stock, shares									158
Stock-based compensation		1,858										1,858
Purchases and transfers of stock by/to deferred compensation plan							174			$ (174)
Purchases and transfer of stock by/to deferred compensation plan, shares										(3)
Distribution of stock from deferred compensation plan							(3)			$ 3
Distribution of stock from deferred compensation plan, shares										1
Balances at Jun. 30, 2018	$ 106	184,814	(77,329)	(33,659)	(18,583)	(25,087)	8,393	1,900,928	$ (542,484)	$ (8,393)		1,466,035
Balance, Common Stock, shares at Jun. 30, 2018	72,960
Balance, Treasury Stock, shares at Jun. 30, 2018									(11,282)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2018										(202)
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, Preferred Stock, shares at Sep. 30, 2018												0
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]											$ 11,971
Net earnings								192,806				$ 192,806
Other comprehensive earnings (loss), net of tax			10,807	811	8,874	1,122						10,807
Cash dividends paid								(28,985)				(28,985)
Purchases of treasury stock									$ (110,311)			(110,311)
Purchases of treasury stock, shares									(1,102)
Sales of treasury stock		(4,808)							$ 38,523			33,715
Sales of treasury stock, shares									1,024
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
Stock-based compensation		15,634										15,634
Purchases and transfers of stock by/to deferred compensation plan							909			$ (909)
Purchases and transfer of stock by/to deferred compensation plan, shares										(11)
Distribution of stock from deferred compensation plan							(222)			$ 222
Distribution of stock from deferred compensation plan, shares										4
Balances (ASC 606 [Member]) at Jun. 30, 2019											50,685
Balances at Jun. 30, 2019	$ 106	205,704	(64,180)	(39,028)	(12,068)	(13,084)	9,118	2,168,204	$ (605,523)	$ (9,118)		$ 1,704,311
Balance, Preferred Stock, shares at Jun. 30, 2019												0
Balance, Common Stock, shares at Jun. 30, 2019	72,960											72,960
Balance, Treasury Stock, shares at Jun. 30, 2019									(11,123)			(11,123)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2019										(209)		(209)
Balances at Mar. 31, 2019	$ 106	204,892	(64,815)	(39,573)	(11,667)	(13,574)	8,876	2,112,168	$ (549,686)	$ (8,876)		$ 1,702,665
Balance, Common Stock, shares at Mar. 31, 2019	72,960
Balance, Treasury Stock, shares at Mar. 31, 2019									(10,757)
Balance, Treasury stock held for deferred compensation, shares at Mar. 31, 2019										(206)
Net earnings | ASC 606 [Member]											663
Net earnings								66,107				66,107
Other comprehensive earnings (loss), net of tax			635	545	(401)	490						635
Cash dividends paid								(10,071)				(10,071)
Purchases of treasury stock									$ (67,058)			(67,058)
Purchases of treasury stock, shares									(645)
Sales of treasury stock		(1,656)							$ 11,221			9,565
Sales of treasury stock, shares									279
Stock-based compensation		2,468										2,468
Purchases and transfers of stock by/to deferred compensation plan							284			$ (284)
Purchases and transfer of stock by/to deferred compensation plan, shares										(3)
Distribution of stock from deferred compensation plan							(42)			$ 42
Balances (ASC 606 [Member]) at Jun. 30, 2019											$ 50,685
Balances at Jun. 30, 2019	$ 106	$ 205,704	(64,180)	(39,028)	$ (12,068)	$ (13,084)	$ 9,118	2,168,204	$ (605,523)	$ (9,118)		$ 1,704,311
Balance, Preferred Stock, shares at Jun. 30, 2019												0
Balance, Common Stock, shares at Jun. 30, 2019	72,960											72,960
Balance, Treasury Stock, shares at Jun. 30, 2019									(11,123)			(11,123)
Balance, Treasury stock held for deferred compensation, shares at Jun. 30, 2019										(209)		(209)
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)