Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-In Capital	Earning Retained in the Business	Treasury Stock	Accumulated Other Comprehensive Income	Other	Total Comprehensive Income	Class A nonvoting common stock	Class A nonvoting common stock Treasury Stock	Common Class A	Common Class A Additional Paid-In Capital	Common Class A Earning Retained in the Business	Common Class A Treasury Stock	Class B Common Stock Earning Retained in the Business
Beginning Balance, Value at Jul. 31, 2007
Value of reacquired shares in connection with its repurchase plan											$ 42,200
Ending Balance, Value at Jul. 31, 2008		548	292,769	639,059	(33,234)	128,161	(5,495)
Net income	70,122			70,122				70,122
Net currency translation adjustment and other (Note 1)						(75,110)		(75,110)
Total comprehensive income	(75,110)							(4,988)
Issuance of Class A Common Stock under stock option plan												(1,995)		3,678
Issuance of Class A Common Stock under stock option plan, Shares									138,934
Other (Note 6)			(1,744)				1,003
Tax benefit from exercise of stock options and deferred compensation distributions			1,336
Stock-based compensation expense (Note 1)			8,099
Value of reacquired shares in connection with its repurchase plan										(40,267)	40,300
Cash dividends on Common Stock
Common Stock, Cash Dividend													(33,492)		(2,347)
Ending Balance, Value at Jul. 31, 2009		548	298,466	673,342	(69,823)	53,051	(4,492)
Net income	81,956			81,956				81,956
Net currency translation adjustment and other (Note 1)						(2,146)		(2,146)
Total comprehensive income	(2,146)							79,810
Issuance of Class A Common Stock under stock option plan												(2,788)		6,505
Issuance of Class A Common Stock under stock option plan, Shares									215,447
Other (Note 6)			(2,512)		(459)		1,663
Tax benefit from exercise of stock options and deferred compensation distributions			1,318
Stock-based compensation expense (Note 1)			9,721
Value of reacquired shares in connection with its repurchase plan										(2,537)	2,500
Cash dividends on Common Stock
Common Stock, Cash Dividend													(34,368)		(2,418)
Ending Balance, Value at Jul. 31, 2010	1,005,027	548	304,205	718,512	(66,314)	50,905	(2,829)
Net income	108,652			108,652				108,652
Net currency translation adjustment and other (Note 1)						62,993		62,993
Total comprehensive income	62,993							171,645
Issuance of Class A Common Stock under stock option plan												(5,684)		13,877
Issuance of Class A Common Stock under stock option plan, Shares									524,144
Other (Note 6)			(1,964)		2,420		(2,035)
Tax benefit from exercise of stock options and deferred compensation distributions			1,140
Stock-based compensation expense (Note 1)			9,830
Cash dividends on Common Stock
Common Stock, Cash Dividend													(35,575)		(2,489)
Ending Balance, Value at Jul. 31, 2011	$ 1,156,192	$ 548	$ 307,527	$ 789,100	$ (50,017)	$ 113,898	$ (4,864)