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Organization and Summary of Significant Accounting Policies - Summary of Effect of Changes to Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Oct. 31, 2018 | Jul. 31, 2018 | May 01, 2018 | Apr. 30, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017
--- | --- | --- | --- | --- | --- | --- | ---
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Total assets | $ 2,134,467 |  |  | $ 2,287,914 |  |  |
Total liabilities | 957,870 |  |  | 1,068,299 |  |  |
Total stockholders’ equity | $ 1,176,597 | $ 1,164,620 |  | $ 1,219,615 | $ 1,134,723 | $ 1,128,751 | $ 1,087,048
Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Total assets |  |  | $ 2,291,410 |  |  |  |
Total liabilities |  |  | 1,065,139 |  |  |  |
Total stockholders’ equity |  |  | 1,226,271 |  |  |  |
Adjustments Due to ASC 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |
Total assets |  |  | 3,496 |  |  |  |
Total liabilities |  |  | (3,160) |  |  |  |
Total stockholders’ equity |  |  | $ 6,656 |  |  |  |

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