Consolidated Statements of Stockholder's Investment (USD $) In Thousands, unless otherwise specified	12 Months Ended							12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2012 Common Stock	Jul. 31, 2011 Common Stock	Jul. 31, 2010 Common Stock	Jul. 31, 2009 Common Stock	Jul. 31, 2012 Additional Paid-In Capital	Jul. 31, 2011 Additional Paid-In Capital	Jul. 31, 2010 Additional Paid-In Capital	Jul. 31, 2012 Additional Paid-In Capital Class A nonvoting common stock	Jul. 31, 2011 Additional Paid-In Capital Class A nonvoting common stock	Jul. 31, 2010 Additional Paid-In Capital Class A nonvoting common stock	Jul. 31, 2012 Earnings Retained in the Business	Jul. 31, 2011 Earnings Retained in the Business	Jul. 31, 2010 Earnings Retained in the Business	Jul. 31, 2012 Earnings Retained in the Business Class A nonvoting common stock	Jul. 31, 2011 Earnings Retained in the Business Class A nonvoting common stock	Jul. 31, 2010 Earnings Retained in the Business Class A nonvoting common stock	Jul. 31, 2012 Earnings Retained in the Business Class B voting common stock	Jul. 31, 2011 Earnings Retained in the Business Class B voting common stock	Jul. 31, 2010 Earnings Retained in the Business Class B voting common stock	Jul. 31, 2012 Treasury Stock	Jul. 31, 2011 Treasury Stock	Jul. 31, 2010 Treasury Stock	Jul. 31, 2012 Treasury Stock Class A nonvoting common stock	Jul. 31, 2011 Treasury Stock Class A nonvoting common stock	Jul. 31, 2010 Treasury Stock Class A nonvoting common stock	Jul. 31, 2012 Accumulated Other Comprehensive Income	Jul. 31, 2011 Accumulated Other Comprehensive Income	Jul. 31, 2010 Accumulated Other Comprehensive Income	Jul. 31, 2012 Other	Jul. 31, 2011 Other	Jul. 31, 2010 Other
Beginning balance	$ 1,156,192			$ 548	$ 548	$ 548	$ 548	$ 307,527	$ 304,205	$ 298,466				$ 789,100	$ 718,512	$ 673,342							$ (50,017)	$ (66,314)	$ (69,823)				$ 113,898	$ 50,905	$ 53,051	$ (4,864)	$ (2,829)	$ (4,492)
Net (loss) income	(17,911)	108,652	81,956											(17,911)	108,652	81,956
Net currency translation adjustment and other (Note 1)	(54,487)	62,993	(2,146)																										(54,487)	62,993	(2,146)
Total comprehensive income	(72,398)	171,645	79,810
Issuance of shares of Class A Common Stock under stock option plan											(3,516)	(5,684)	(2,788)													7,380	13,877	6,505
Other (Note 6)								(1,637)	(1,964)	(2,512)													(30)	2,420	(459)							1,560	(2,035)	1,663
Tax benefit from exercise of stock options and deferred compensation distributions								1,167	1,140	1,318
Stock-based compensation expense (Note 1)								9,467	9,830	9,721
Purchase of shares of Class A Common Stock																										(49,933)		(2,537)
Cash dividends on Common Stock
Cash dividends on Common Stock																	(36,340)	(35,575)	(34,368)	(2,559)	(2,489)	(2,418)
Ending balance	$ 1,009,353	$ 1,156,192		$ 548	$ 548	$ 548	$ 548	$ 313,008	$ 307,527	$ 304,205				$ 732,290	$ 789,100	$ 718,512							$ (92,600)	$ (50,017)	$ (66,314)				$ 59,411	$ 113,898	$ 50,905	$ (3,304)	$ (4,864)	$ (2,829)