Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total stockholders equity	Preferred Stock [Member]	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 in Equity [Member]	Retained Earnings [Member]	Treasury Stock at Cost [Member]	Treasury Stock Held for Deferred Compensaton [Member]	Total
Balances at Sep. 30, 2015	$ 1,153,104		$ 106	$ 131,231	$ (51,458)	$ (21,610)	$ 166	$ (30,014)	$ 4,322	$ 1,495,274	$ (422,049)	$ (4,322)
Balance, Common Stock, shares at Sep. 30, 2015			72,960
Balance, Treasury Stock, shares at Sep. 30, 2015											(9,763)	(173)
Net earnings	180,838	$ 0	$ 0	0	0	0	0	0	0	180,838	$ 0	$ 0	$ 180,838
Other comprehensive income (loss), net of tax	(14,247)	0	0	0	(14,247)	(4,361)	13	(9,899)	0	0	0	0
Cash dividends paid	(26,606)	0	0	0	0	0	0	0	0	(26,606)	0	0
Purchases of treasury stock	(126,295)	0	0	0	0	0	0	0	0	0	$ (126,295)	0
Purchases of treasury stock, shares											(2,660)
Sales of treasury stock	16,645	0	0	(10,137)	0	0	0	0	0	0	$ 26,782	0
Sales of treasury stock, shares											732
Common shares issued from treasury stock to settle employee liabilities	13,999	0	0	5,319	0	0	0	0	0	0	$ 8,680	0	0
Common shares issued from treasury stock to settle employee liabilities, shares											317
Common shares issued from treasury stock for benefit plans													$ 13,999
Common shares issued from treasury stock for benefit plans, shares													317
Tax benefit attributable to stock-based compensation	35	0	0	35	0	0	0	0	0	0	$ 0	0
Stock-based compensation	15,122	0	0	15,122	0	0	0	0	0	0	0	0
Purchases of stock by deferred compensation plan	0	0	0	0	0	0	0	0	1,269	0	0	$ (1,269)
Purchases of stock by deferred compensation plan, shares												(25)
Distribution of stock from deferred compensation plan	0	$ 0	0	0	0	0	0	0	(502)	0	0	$ 502
Distribution of stock from deferred compensation plan, shares												41
Balances at Sep. 30, 2016	1,212,595		$ 106	141,570	(65,705)	(25,971)	179	(39,913)	5,089	1,649,506	$ (512,882)	$ (5,089)
Balance, Preferred Stock, shares at Sep. 30, 2016		0
Balance, Common Stock, shares at Sep. 30, 2016			72,960
Balance, Treasury Stock, shares at Sep. 30, 2016											(11,374)	(157)
Net earnings	200,507									200,507			$ 200,507
Other comprehensive income (loss), net of tax	12,519				12,519	(1,309)	(44)	13,872
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	15,668			(2,257)							$ 17,925
Sales of treasury stock, shares											466
Common shares issued from treasury stock to settle employee liabilities	1,767			740					1,767		$ 1,027	$ (1,767)	1,767
Common shares issued from treasury stock to settle employee liabilities, shares											26	(26)
Common shares issued from treasury stock for benefit plans	14,014			6,501							$ 7,513		$ 14,014
Common shares issued from treasury stock for benefit plans, shares											199		199
Stock-based compensation	17,282			17,282
Purchases of stock by deferred compensation plan									298			$ (298)
Purchases of stock by deferred compensation plan, shares												(3)
Distribution of stock from deferred compensation plan									(19)			$ 19
Balances at Sep. 30, 2017	1,371,383		$ 106	163,836	(53,186)	(27,280)	135	(26,041)	7,135	1,820,268	$ (559,641)	$ (7,135)	$ 1,371,383
Balance, Preferred Stock, shares at Sep. 30, 2017		0											0
Balance, Common Stock, shares at Sep. 30, 2017			72,960										72,960
Balance, Treasury Stock, shares at Sep. 30, 2017											(11,739)		(11,739)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2017												(186)	(186)
Net earnings	180,378									180,378			$ 180,378
Other comprehensive income (loss), net of tax	(21,756)				(21,756)	(12,514)	(21,077)	11,835
Cash dividends paid	(34,003)									(34,003)
Sales of treasury stock	9,132			(3,517)							$ 12,649
Sales of treasury stock, shares											334
Common shares issued from treasury stock to settle employee liabilities													0
Common shares issued from treasury stock for benefit plans	14,741			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 of stock by deferred compensation plan									1,318			$ (1,318)
Purchases of stock by deferred compensation plan, shares												(17)
Distribution of stock from deferred compensation plan									(22)			$ 22
Distribution of stock from deferred compensation plan, shares												1
Balances at Sep. 30, 2018	$ 1,538,104		$ 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											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)