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Quarterly Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2016
Apr. 30, 2016
 [2]
Jan. 31, 2016
 [2]
Oct. 31, 2015
 [2]
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2015
Oct. 31, 2014
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 332,659 [1] $ 347,246 [1] $ 299,706 [1] $ 288,838 [1] $ 282,293 [1] $ 297,142 [1] $ 276,258 [1] $ 290,386 [1] $ 1,268,449 $ 1,146,079 $ 1,163,489
Gross margin [1] 141,464 157,647 124,614 120,861 118,784 127,417 114,867 122,308      
Operating income 106,191 [1] 121,948 [1] 92,085 [1] 86,246 [1] 86,765 [1] 94,767 [1] 80,468 [1] 82,401 [1] 406,470 344,401 274,934
Income before income taxes 105,985 [1] 116,568 [1] 91,552 [1] 81,760 [1] 81,446 [1] 88,296 [1] 80,104 [1] 82,223 [1] 395,865 332,069 270,035
Net income $ 84,120 [1] $ 74,623 [1] $ 59,007 [1] $ 52,610 [1] $ 57,412 [1] $ 57,563 [1] $ 52,193 [1] $ 52,615 [1] $ 270,360 $ 219,783 $ 178,687
Basic net income per share (in dollars per share) $ 0.77 [1] $ 0.68 [1] $ 0.50 [1] $ 0.44 [1] $ 0.46 [1] $ 0.46 [1] $ 0.41 [1] $ 0.42 [1] $ 2.36 $ 1.75 $ 1.42
Diluted net income per share (in dollars per share) $ 0.71 [1] $ 0.63 [1] $ 0.47 [1] $ 0.41 [1] $ 0.44 [1] $ 0.44 [1] $ 0.40 [1] $ 0.40 [1] $ 2.21 $ 1.67 $ 1.36
[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.
[2] Net income and earnings per share data were revised from previously reported amounts due to the adoption of ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting. See Note 1 — Summary of Significant Accounting Policies.