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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Statement Of Other Comprehensive Income [Abstract]
Net income, as reported	$ 182,119	$ 166,375	$ 151,627
Other comprehensive income:
Interest rate swap, net of tax effects of $1,762, $0, and $0	(3,110)
Foreign currency translation adjustments	(11,708)	9,516	(5,659)
Total comprehensive income	$ 167,301	$ 175,891	$ 145,968

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