Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Stock Compensation Plans [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Jul. 31, 2008	$ 443,216		$ 522,476	$ 27,065	$ 112,883	$ (365,605)	$ 740,035
Comprehensive income
Net earnings			131,907				131,907
Foreign currency translation					(63,385)		(63,385)
Pension liability adjustment, net of deferred taxes					(58,593)		(58,593)
Net gain (loss) on cash flow hedging derivatives					(582)		(582)
Comprehensive income							9,347
Treasury stock acquired						(32,773)	(32,773)
Stock options exercised		(2,998)	(6,151)			12,104	2,955
Deferred stock and other activity		(529)	(88)	(4,344)		3,710	(1,251)
Performance awards		(266)	(60)	(2,827)		1,932	(1,221)
Stock option expense			4,143				4,143
Tax reduction - employee plans		3,793					3,793
Adjustment to adopt retirement benefit compensation guidance, net of tax			(887)				(887)
Dividends (per share)			(35,523)				(35,523)
Balance at Jul. 31, 2009	443,216		615,817	19,894	(9,677)	(380,632)	688,618
Comprehensive income
Net earnings			166,163				166,163
Foreign currency translation					(15,961)		(15,961)
Pension liability adjustment, net of deferred taxes					(14,780)		(14,780)
Net gain (loss) on cash flow hedging derivatives					(68)		(68)
Comprehensive income							135,354
Treasury stock acquired						(66,696)	(66,696)
Stock options exercised		(5,608)	(7,678)	2,676		22,951	12,341
Deferred stock and other activity		(704)	(30)	(244)		1,707	729
Performance awards		7	(7)
Stock option expense			6,891				6,891
Tax reduction - employee plans		6,305					6,305
Dividends (per share)			(36,909)				(36,909)
Balance at Jul. 31, 2010	443,216		744,247	22,326	(40,486)	(422,670)	746,633
Comprehensive income
Net earnings			225,291				225,291
Foreign currency translation					72,505		72,505
Pension liability adjustment, net of deferred taxes					7,166		7,166
Net gain (loss) on cash flow hedging derivatives					842		842
Comprehensive income							305,804
Treasury stock acquired						(108,929)	(108,929)
Stock options exercised		(10,792)	(7,854)	1,862		30,604	13,820
Deferred stock and other activity		(1,418)	174	548		2,185	1,489
Performance awards		(7)	7
Stock option expense			6,462				6,462
Tax reduction - employee plans		12,217					12,217
Dividends (per share)			(42,785)				(42,785)
Balance at Jul. 31, 2011	$ 443,216		$ 925,542	$ 24,736	$ 40,027	$ (498,810)	$ 934,711