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Revenue Recognition and Contracts with Customers - Schedule of Adjustments to Condensed Consolidated Balance Sheet on Adoption of ASU 2014-09 (Detail) - USD ($) $ in Thousands | Jul. 31, 2018 | May 01, 2018 | Apr. 30, 2018
--- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accrued expenses | $ 37,524 |  | $ 41,632
Deferred revenue from contracts with customers | 13,621 |  | 23,305
Deferred taxes |  |  | 12,895
Retained earnings | $ 392,181 |  | $ 389,146
ASU 2014-09 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accrued expenses |  | $ 24,456 |
Deferred revenue from contracts with customers |  | 23,305 |
Deferred taxes |  | 11,376 |
Retained earnings |  | 384,536 |
ASU 2014-09 | Accounting Standard Adjustments |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accrued expenses |  | (17,176) |
Deferred revenue from contracts with customers |  | 23,305 |
Deferred taxes |  | (1,519) |
Retained earnings |  | $ (4,610) |

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