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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Statement Of Other Comprehensive Income [Abstract]    
Net income $ 52,615 $ 41,422
Other comprehensive income:    
Unrealized gain on interest rate swaps, net (a) 404 [1] 301 [1]
Reclassification adjustment of interest rate swaps, net (b) (312) [2] (378) [2]
Foreign currency translation adjustments (23,968) 14,558
Total comprehensive income $ 28,739 $ 55,903
[1] Net of tax effect of $(228) and $(164) for the three months ended October 31, 2014 and 2013, respectively.
[2] Net of tax effect of $176 and $208 for the three months ended October 31, 2014 and 2013, respectively.