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Quarterly Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2014
Apr. 30, 2014
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 282,293 [1] $ 297,142 [1] $ 276,258 [1] $ 290,386 [1] $ 287,450 [1] $ 309,722 [1] $ 286,434 [1] $ 279,883 [1] $ 1,146,079 $ 1,163,489 $ 1,046,386
Gross margin [1] 118,784 127,417 114,867 122,308 116,939 132,252 111,546 107,836      
Operating income 86,765 [1] 94,767 [1] 80,468 [1] 82,401 [1] 75,858 [1] 62,633 [1] 71,484 [1] 64,959 [1] 344,401 274,934 282,992
Income before income taxes 81,446 [1] 88,296 [1] 80,104 [1] 82,223 [1] 73,884 [1] 61,318 [1] 70,588 [1] 64,245 [1] 332,069 270,035 276,872
Net income $ 57,412 [1] $ 57,563 [1] $ 52,193 [1] $ 52,615 [1] $ 51,043 [1] $ 40,877 [1] $ 45,345 [1] $ 41,422 [1] $ 219,783 $ 178,687 $ 180,025
Basic net income per share (in dollars per share) $ 0.46 [1] $ 0.46 [1] $ 0.41 [1] $ 0.42 [1] $ 0.41 [1] $ 0.32 [1] $ 0.36 [1] $ 0.33 [1] $ 1.75 $ 1.42 $ 1.44
Diluted net income per share (in dollars per share) $ 0.44 [1] $ 0.44 [1] $ 0.40 [1] $ 0.40 [1] $ 0.39 [1] $ 0.31 [1] $ 0.35 [1] $ 0.32 [1] $ 1.67 $ 1.36 $ 1.39
[1] Earnings per share were computed independently for each of the periods presented; therefore, the sum of the earnings per share amounts for the quarters may not equal the total for the year.