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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Statement Of Other Comprehensive Income [Abstract]        
Net income $ 40,877 $ 53,236 $ 127,644 $ 138,721
Other comprehensive income:        
Unrealized gain on interest rate swaps, net 523 [1] 90 [1] 1,415 [1] 1,744 [1]
Reclassification adjustment of interest rate swaps, net (354) [2] (391) [2] (1,098) [2] (1,225) [2]
Foreign currency translation adjustments 9,720 (4,507) 25,015 446
Total comprehensive income $ 50,766 $ 48,428 $ 152,976 $ 139,686
[1] Net of tax effect of $(274) and $(769) for the three and nine months ended April 30, 2014. Net of tax effect of $(41) and $(378) for the three and nine months ended April 30, 2013.
[2] Net of tax effect reclassification adjustment of $178 and $590 for the three and nine months ended April 30, 2014. Net of tax effect reclassification adjustment of $212 and $671 for the three and nine months ended April 30, 2013.