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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Statement Of Other Comprehensive Income [Abstract]      
Net income, as reported $ 180,025 $ 182,119 $ 166,375
Other comprehensive income:      
Unrealized gain (loss) on interest rate swaps, net of tax effects of $(1,647), $1,045, and $0 2,993 (1,749)  
Reclassification adjustment of interest rate swaps to net income, net of tax effects of $874, $717, and $0 (1,624) (1,361)  
Foreign currency translation adjustments (10,487) (11,708) 9,516
Total comprehensive income $ 170,907 $ 167,301 $ 175,891