Condensed Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive 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]	Noncontrolling Interest in Consolidated Subsidiary [Member]	Total
Beginning Balance at Sep. 30, 2009	$ 106	$ 73,197	$ 10,129	$ 29,464	$ (801)	$ (18,534)	$ 4,904	$ 741,505	$ (115,478)	$ (4,904)	$ 2,056	$ 711,515
Beginning Balance, Treasury Stock, shares at Sep. 30, 2009									(4,621)
Beginning Balance, Common Stock, shares at Sep. 30, 2009	72,960
Beginning Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2009										(389)
Net earnings								78,169			318	78,487
Cash dividends paid								(12,316)			(655)	(12,971)
Purchase of Treasury Stock									(2,383)			(2,383)
Purchase of Treasury Stock, shares									(85)
Sale of Treasury Stock		(1,114)							3,760			2,646
Sale of Treasury Stock, shares									266
Purchase of noncontrolling interest		(6,180)	(116)	(116)							(1,824)	(8,120)
Tax benefit attributable to exercise of stock options		1,588										1,588
Stock-based compensation		5,186										5,186
Purchase of stock by deferred compensation plan		24					144		41	(144)		65
Purchase of stock by deferred compensation plan, shares									3	(3)
Distribution of stock from deferred compensation plan							(175)			175
Distribution of stock from deferred compensation plan, shares										35
Foreign currency translation adjustments			(29,525)	(29,525)							163	(29,362)
Reclassification of realized losses on derivatives to earnings			211		211							211
Minimum retirement benefits liability adjustment			396			396						396
Taxes on changes in accumulated other comprehensive earnings			1,832	2,233	(80)	(321)					(58)	1,774
Ending Balance at Jun. 30, 2010	106	72,701	(17,073)	2,056	(670)	(18,459)	4,873	807,358	(114,060)	(4,873)		749,032
Ending Balance, Treasury Stock, shares at Jun. 30, 2010									(4,437)
Ending Balance, Common Stock, shares at Jun. 30, 2010	72,960
Ending Balance, Treasury stock held for deferred compensation, Shares at Jun. 30, 2010										(357)
Beginning Balance at Sep. 30, 2010	106	73,915	6,342	23,152	(627)	(16,183)	4,888	835,919	(113,088)	(4,888)		803,194
Beginning Balance, Treasury Stock, shares at Sep. 30, 2010									(4,223)			(4,223)
Beginning Balance, Common Stock, shares at Sep. 30, 2010	72,960											72,960
Beginning Balance, Preferred Stock, shares at Sep. 30, 2010												0
Beginning Balance, Treasury stock held for deferred compensation, Shares at Sep. 30, 2010										(356)		(356)
Net earnings								90,545				90,545
Cash dividends paid								(13,764)				(13,764)
Purchase of Treasury Stock									(7,961)			(7,961)
Purchase of Treasury Stock, shares									(242)
Sale of Treasury Stock		(1,754)							4,963			3,209
Sale of Treasury Stock, shares									310
Tax benefit attributable to exercise of stock options		2,581										2,581
Stock-based compensation		5,370										5,370
Purchase of stock by deferred compensation plan		33					128			(128)		33
Purchase of stock by deferred compensation plan, shares									2	(2)
Distribution of stock from deferred compensation plan							(445)			445
Distribution of stock from deferred compensation plan, shares										43
Foreign currency translation adjustments			17,043	17,043								17,043
Reclassification of realized losses on derivatives to earnings			172		172							172
Minimum retirement benefits liability adjustment			(413)			(413)						(413)
Taxes on changes in accumulated other comprehensive earnings			(1,711)	(1,791)	(65)	145						(1,711)
Ending Balance at Jun. 30, 2011	$ 106	$ 80,145	$ 21,433	$ 38,404	$ (520)	$ (16,451)	$ 4,571	$ 912,700	$ (116,086)	$ (4,571)		$ 898,298
Ending Balance, Treasury Stock, shares at Jun. 30, 2011									(4,153)			(4,153)
Ending Balance, Common Stock, shares at Jun. 30, 2011	72,960											72,960
Ending Balance, Preferred Stock, shares at Jun. 30, 2011												0
Ending Balance, Treasury stock held for deferred compensation, Shares at Jun. 30, 2011										(315)		(315)