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, 2012	$ 1,008,115	$ 106	$ 97,826	$ (11,723)	$ 17,447	$ (376)	$ (28,794)	$ 4,344	$ 1,069,811	$ (147,905)	$ (4,344)
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, 2012		72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2012										(4,536,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2012											(276,000)
Net earnings	145,942								145,942			$ 145,942
Other comprehensive income (loss), net of tax	26,838			26,838	8,295	419	18,124
Cash dividends paid	(21,866)								(21,866)
Purchases of treasury stock	(51,846)									$ (51,846)
Purchases of treasury stock, shares										(1,395,000)
Sales of treasury stock	10,916		(13,194)							$ 24,110
Sales of treasury stock, shares										796,000
Common shares issued from treasury stock for benefit plans	9,780		1,923							$ 7,857
Common shares issued from treasury stock for benefit plans, shares										250,000
Tax benefit attributable to stock-based compensation	5,154		5,154
Stock-based compensation	9,414		9,414
Transfer of stock to deferred compensation plan	98		24					97		$ 74	$ (97)
Transfer of stock to deferred compensation plan, shares										2,000	(2,000)
Purchases of stock by deferred compensation plan								79			$ (79)
Purchases of stock by deferred compensation plan, shares											(2,000)
Distribution of stock from deferred compensation plan								(513)			$ 513
Distribution of stock from deferred compensation plan, shares											48,000
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)
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)	1,160,944
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
Balance, Preferred Stock, shares at Sep. 30, 2014												0
Balance, Common Stock, shares at Sep. 30, 2014		72,960,000										72,960,000
Balance, Treasury Stock, shares at Sep. 30, 2014										(7,397,000)		(7,397,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2014											(198,000)	(198,000)
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, Treasury Stock, shares at Sep. 30, 2014										(7,397,000)		(7,397,000)
Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2014											(198,000)	(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
Transfer of stock to 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
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)