Consolidated Statements of Stockholders' Equity - USD ($) $ 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, Preferred Stock, shares at Sep. 30, 2015		0
Balance, Common Stock, shares at Sep. 30, 2015			72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2015											(9,763,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2015												(173,000)
Net earnings	117,691									117,691			$ 117,691
Other comprehensive income (loss), net of tax	(6,726)				(6,726)	(8,427)	25	1,676
Cash dividends paid	(19,841)									(19,841)
Purchases of treasury stock	(126,295)										$ (126,295)
Purchases of treasury stock, shares											(2,660,000)
Sales of treasury stock	13,286			(7,961)							$ 21,247
Sales of treasury stock, shares											605,000
Common shares issued from treasury stock to settle employee liabilities													0
Common shares issued from treasury stock for benefit plans	13,999			5,319							$ 8,680		$ 13,999
Common shares issued from treasury stock for benefit plans, shares											317,000		317,000
Tax benefit attributable to stock-based compensation	39			39
Stock-based compensation	13,267			13,267
Purchases of stock by deferred compensation plan									1,232			$ (1,232)
Purchases of stock by deferred compensation plan, shares												(25,000)
Distribution of stock from deferred compensation plan									(493)			$ 493
Distribution of stock from deferred compensation plan, shares												41,000
Balances at Jun. 30, 2016	1,158,524		$ 106	141,895	(58,184)	(30,037)	191	(28,338)	5,061	1,593,124	$ (518,417)	$ (5,061)
Balance, Preferred Stock, shares at Jun. 30, 2016		0
Balance, Common Stock, shares at Jun. 30, 2016			72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2016											(11,501,000)
Balance, Treasury stock held for deferred compensation, Shares at Jun. 30, 2016												(157,000)
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)	$ 1,212,595
Balance, Preferred Stock, shares at Sep. 30, 2016		0											0
Balance, Common Stock, shares at Sep. 30, 2016			72,960,000										72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2016											(11,374,000)		(11,374,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2016												(157,000)	(157,000)
Net earnings	138,279									138,279			$ 138,279
Other comprehensive income (loss), net of tax	(2,912)				(2,912)	(4,330)	(33)	1,451
Cash dividends paid	(22,076)									(22,076)
Purchases of treasury stock	(63,255)										$ (63,255)
Purchases of treasury stock, shares											(915,000)
Sales of treasury stock	14,027			(2,130)							$ 16,157
Sales of treasury stock, shares											416,000
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											26,000	(26,000)
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											199,000		199,000
Stock-based compensation	15,580			15,580
Purchases of stock by deferred compensation plan									254			$ (254)
Purchases of stock by deferred compensation plan, shares												(3,000)
Distribution of stock from deferred compensation plan									(10)			$ 10
Balances at Jun. 30, 2017	$ 1,308,019		$ 106	$ 162,261	$ (68,617)	$ (30,301)	$ 146	$ (38,462)	$ 7,100	$ 1,765,709	$ (551,440)	$ (7,100)	$ 1,308,019
Balance, Preferred Stock, shares at Jun. 30, 2017		0											0
Balance, Common Stock, shares at Jun. 30, 2017			72,960,000										72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2017											(11,648,000)		(11,648,000)
Balance, Treasury stock held for deferred compensation, Shares at Jun. 30, 2017												(186,000)	(186,000)