Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Stock Compensation Plan [Member]	Accumulated Other Comprehensive Income [Member]	Treasury Stock [Member]	Total
Balance at Jul. 31, 2012	$ 758,216		$ 366,788	$ 24,948	$ (101,888)	$ (138,050)	$ 910,014
Comprehensive income
Net earnings			247,377				247,377
Foreign currency translation					17,435		17,435
Pension liability adjustment, net of deferred taxes					46,860		46,860
Net gain on cash flow hedging derivatives					120		120
Total comprehensive income							311,792
Treasury stock acquired						(102,572)	(102,572)
Stock options exercised		$ (10,836)	(21,256)			44,463	12,371
Deferred stock and other activity		(2,125)	(1,677)	(1,586)		4,496	(892)
Performance awards		(573)	(1,161)	(1,617)		2,055	(1,296)
Stock option expense			8,300				8,300
Tax reduction - employee plans		13,534					13,534
Dividends (per share)			(66,064)				(66,064)
Balance at Jul. 31, 2013	758,216		532,307	21,745	(37,473)	(189,608)	1,085,187
Comprehensive income
Net earnings			260,224				260,224
Foreign currency translation					(2,122)		(2,122)
Pension liability adjustment, net of deferred taxes					(6,286)		(6,286)
Net gain on cash flow hedging derivatives					71		71
Total comprehensive income							251,887
Treasury stock acquired						(279,395)	(279,395)
Stock options exercised		(7,000)	(10,493)			30,538	13,045
Deferred stock and other activity		(3,144)	(1,772)	(431)		4,855	(492)
Performance awards		(409)	(505)	(1,713)		1,651	(976)
Stock option expense			9,933				9,933
Tax reduction - employee plans		10,553					10,553
Dividends (per share)			(87,259)				(87,259)
Balance at Jul. 31, 2014	758,216		702,435	19,601	(45,810)	(431,959)	1,002,483
Comprehensive income
Net earnings			208,111				208,111
Foreign currency translation					(119,130)		(119,094)
Pension liability adjustment, net of deferred taxes					3,405		3,405
Net gain on cash flow hedging derivatives					(455)		(491)
Total comprehensive income							91,931
Treasury stock acquired						(256,267)	(256,267)
Stock options exercised		(5,685)	(13,155)			30,210	11,370
Deferred stock and other activity		(1,917)	(678)	(1,077)		2,943	(729)
Performance awards		(121)	(159)	(672)		598	(354)
Stock option expense			9,534				9,534
Tax reduction - employee plans		$ 7,723					7,723
Dividends (per share)			(90,922)				(90,922)
Balance at Jul. 31, 2015	$ 758,216		$ 815,166	$ 17,852	$ (161,990)	$ (654,475)	$ 778,651