CONSOLIDATED STATEMENTS OF STOCKHOLDERS' INVESTMENT - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Increase Decrease In Stockholders Equity Roll Forward
Common Stock, Value, Issued	$ 548	$ 548	$ 548
Beginning Balances	733,076
Net earnings (loss)	2,987	(45,968)	(154,535)
Other comprehensive (loss) income, net of tax	(109,190)	8,093	(3,348)
Stock-based compensation expense	4,471	5,214	1,736
Purchase of shares of Class A Common Stock	0	(30,581)	(5,121)
Ending Balances	587,688	733,076
Additional Paid-in Capital [Member]
Increase Decrease In Stockholders Equity Roll Forward
Beginning Balances	311,811	306,191	313,008
Issuance of shares of Class A Common Stock under stock plan	(1,315)	847	(9,721)
Stockholder's equity, other	2,312	(371)	(1,266)
Tax (shortfall) benefit from exercise of stock options, vesting of RSUs, and deferred compensation distributions	(2,876)	(70)	2,434
Stock-based compensation expense	4,471	5,214	1,736
Ending Balances	314,403	311,811	306,191
Retained Earnings [Member]
Increase Decrease In Stockholders Equity Roll Forward
Beginning Balances	452,057	538,512	732,290
Net earnings (loss)	2,987	(45,968)	(154,535)
Payment of Ordinary Dividends, Common Stock Class A	(38,204)	(37,786)	(36,613)
Payment of Ordinary Dividends, Common Stock Class B	(2,771)	(2,701)	(2,630)
Ending Balances	414,069	452,057	538,512
Treasury Stock [Member]
Increase Decrease In Stockholders Equity Roll Forward
Beginning Balances	93,337	69,797	92,600
Issuance of shares of Class A Common Stock under stock plan	(2,735)	(11,266)	(30,045)
Stockholder's equity, other	(2,632)	(4,225)	(2,121)
Purchase of shares of Class A Common Stock		(30,581)	(5,121)
Ending Balances	93,234	93,337	69,797
Accumulated Other Comprehensive Income (Loss) [Member]
Increase Decrease In Stockholders Equity Roll Forward
Beginning Balances	64,156	56,063	59,411
Other comprehensive (loss) income, net of tax	(109,190)	8,093	(3,348)
Ending Balances	(45,034)	64,156	56,063
Other equity component [Member]
Increase Decrease In Stockholders Equity Roll Forward
Beginning Balances	(2,159)	(720)	(3,304)
Stockholder's equity, other	(905)	(1,439)	2,584
Ending Balances	$ (3,064)	$ (2,159)	$ (720)