Condensed 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, 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	131,392								131,392			$ 131,392
Other comprehensive income (loss), net of tax	(25,769)			(25,769)	(26,455)	46	640
Cash dividends paid	(18,285)								(18,285)
Purchases of treasury stock	(157,118)									$ (157,118)
Purchases of treasury stock, shares										(2,670,000)
Sales of treasury stock	7,936		(4,841)							$ 12,777
Sales of treasury stock, shares										428,000
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	4,511		4,511
Stock-based compensation	11,086		11,086
Purchases of stock by deferred compensation plan								876			$ (876)
Purchases of stock by deferred compensation plan, shares											(18,000)
Distribution of stock from deferred compensation plan								(477)			$ 477
Distribution of stock from deferred compensation plan, shares											43,000
Balances at Jun. 30, 2015	1,127,271	$ 106	127,737	(29,302)	(15,636)	151	(13,817)	4,314	1,451,575	$ (422,845)	$ (4,314)
Balance, Common Stock, shares at Jun. 30, 2015		72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2015										(9,380,000)
Balance, Treasury stock held for deferred compensation, Shares at Jun. 30, 2015											(173,000)
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	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 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	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)	$ 1,158,524
Balance, Preferred Stock, shares at Jun. 30, 2016												0
Balance, Common Stock, shares at Jun. 30, 2016		72,960,000										72,960,000
Balance, Treasury Stock, shares at Jun. 30, 2016										(11,501,000)		(11,501,000)
Balance, Treasury stock held for deferred compensation, Shares at Jun. 30, 2016											(157,000)	(157,000)