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Quarterly Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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.

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