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Acquisition - Summary of Net Assets Acquired (Detail) - USD ($) $ in Thousands | Apr. 30, 2020 | Nov. 01, 2019 | Apr. 30, 2019 | Apr. 30, 2018
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Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 613,943 |  | $ 578,298 | $ 584,222
Acquired Companies |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets | [1] |  | $ 44,475 |  |
Long-term assets |  |  | 15,024 |  |
Intangibles assets |  |  | 45,400 |  |
Current liabilities |  |  | 29,503 |  |
Long-term liabilities |  |  | 5,720 |  |
Net assets acquired |  |  | 69,676 |  |
Purchase price |  |  | 108,602 |  |
Goodwill |  |  | $ 38,926 |  |
[1] | Included in current assets is acquired receivables in the amount of $41.1 million.

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