Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total stockholders equity	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, 2013	$ 1,142,545	$ 106	$ 101,147	$ 15,115	$ 25,742	$ 43	$ (10,670)	$ 4,007	$ 1,193,887	$ (167,710)	$ (4,007)
Balance, Common Stock, shares at Sep. 30, 2013		72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2013										(4,883,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2013											(232,000)
Net earnings	165,844								165,844			$ 165,844
Other comprehensive income (loss), net of tax	(18,648)			(18,648)	(14,923)	62	(3,787)
Cash dividends paid	(21,263)								(21,263)
Purchases of treasury stock	(144,510)									$ (144,510)
Purchases of treasury stock, shares										(3,336,000)
Sales of treasury stock	11,059		(6,217)							$ 17,276
Sales of treasury stock, shares										562,000
Common shares issued from treasury stock for benefit plans	11,193		2,837							$ 8,356
Common shares issued from treasury stock for benefit plans, shares										260,000
Tax benefit attributable to stock-based compensation	3,483		3,483
Stock-based compensation	11,241		11,241
Purchases of stock by deferred compensation plan								370			$ (370)
Purchases of stock by deferred compensation plan, shares											(8,000)
Distribution of stock from deferred compensation plan								(462)			$ 462
Distribution of stock from deferred compensation plan, shares											42,000
Balances at Sep. 30, 2014	1,160,944	$ 106	112,491	(3,533)	10,819	105	(14,457)	3,915	1,338,468	$ (286,588)	$ (3,915)
Balance, Common Stock, shares at Sep. 30, 2014		72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2014										(7,397,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2014											(198,000)
Net earnings	181,452								181,452			181,452
Other comprehensive income (loss), net of tax	(47,925)			(47,925)	(32,429)	61	(15,557)
Cash dividends paid	(24,646)								(24,646)
Purchases of treasury stock	(160,294)									$ (160,294)
Purchases of treasury stock, shares										(3,193,000)
Sales of treasury stock	9,932		(6,817)							$ 16,749
Sales of treasury stock, shares										568,000
Common shares issued from treasury stock for benefit plans	12,574		4,490							$ 8,084
Common shares issued from treasury stock for benefit plans, shares										259,000
Tax benefit attributable to stock-based compensation	6,812		6,812
Stock-based compensation	14,255		14,255
Purchases of stock by deferred compensation plan								893			$ (893)
Purchases of stock by deferred compensation plan, shares											(18,000)
Distribution of stock from deferred compensation plan								(486)			$ 486
Distribution of stock from deferred compensation plan, shares											43,000
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)	$ 1,153,104
Balance, Preferred Stock, shares at Sep. 30, 2015												0
Balance, Common Stock, shares at Sep. 30, 2015		72,960,000										72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2015										(9,763,000)		(9,763,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2015											(173,000)	(173,000)
Net earnings	180,838								180,838			$ 180,838
Other comprehensive income (loss), net of tax	(14,247)			(14,247)	(4,361)	13	(9,899)
Cash dividends paid	(26,606)								(26,606)
Purchases of treasury stock	(126,295)									$ (126,295)
Purchases of treasury stock, shares										(2,660,000)
Sales of treasury stock	16,645		(10,137)							$ 26,782
Sales of treasury stock, shares										732,000
Common shares issued from treasury stock for benefit plans	13,999		5,319							$ 8,680
Common shares issued from treasury stock for benefit plans, shares										317,000
Tax benefit attributable to stock-based compensation	35		35
Stock-based compensation	15,122		15,122
Purchases of stock by deferred compensation plan								1,269			$ (1,269)
Purchases of stock by deferred compensation plan, shares											(25,000)
Distribution of stock from deferred compensation plan								(502)			$ 502
Distribution of stock from deferred compensation plan, shares											41,000
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
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)