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Supplementary Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Supplementary Quarterly Financial Information - Results By Quarter (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 477,300 |  | $ 455,700 |  | $ 451,700 |  | $ 411,400 |  | $ 452,200 |  | $ 436,400 |  | $ 425,600 |  | $ 404,300 |  | $ 1,796,103 | $ 1,718,530 | $ 1,727,037
Gross profit | 351,800 |  | 330,500 |  | 331,900 |  | 296,700 |  | 332,900 |  | 320,100 |  | 314,000 |  | 290,800 |  | 1,310,900 | 1,257,800 |
Operating income | 74,800 |  | 67,400 |  | 82,800 |  | 14,500 |  | 63,500 |  | 51,200 |  | 47,700 |  | 43,800 |  | 239,535 | 206,153 | 188,113
Net income | $ 54,200 |  | $ 68,800 |  | $ 60,000 |  | $ 9,200 |  | $ 46,700 |  | $ 47,400 |  | $ (11,500) |  | $ 31,000 |  | $ 192,186 | $ 113,643 | $ 145,782
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.95 | [1] | $ 1.21 | [1] | $ 1.06 | [1] | $ 0.16 | [1] | $ 0.82 | [1] | $ 0.83 | [1] | $ (0.20) | [1] | $ 0.54 | [1] | $ 3.37 | $ 1.98 | $ 2.51
Diluted (in dollars per share) | $ 0.93 | [1] | $ 1.19 | [1] | $ 1.04 | [1] | $ 0.16 | [1] | $ 0.81 | [1] | $ 0.82 | [1] | $ (0.20) | [1] | $ 0.53 | [1] | $ 3.32 | $ 1.95 | $ 2.48
[1] | The sum of the quarterly earnings per share amounts may not agree to the respective annual amounts due to rounding.

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