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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 USD ($) Segment | Jul. 31, 2020 USD ($) | Apr. 30, 2021 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of business segments | Segment | 7 |  |
Number of line of business | Segment | 4 |  |
Credit loss for available for sales debt securities | $ 0 | $ 0 |
Impairment of long-lived assets | 0 | 0 |
Impairment of goodwill | 0 |  | $ 0
Impairment of intangible assets | 0 |  | $ 0
Performance-related bonus expenses | $ 96,000,000.0 | 59,900,000 |
ASU 2021-01 |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Change in accounting principle, accounting standards update, adopted | true |  |
Change in accounting principle, accounting standards update, adoption date | May 01, 2021 |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  |
Minimum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful lives | 1 year |  |
Amortization of long-term retention awards | 4 years |  |
Maximum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful lives | 24 years |  |
Amortization of long-term retention awards | 5 years |  |
Acquired Companies |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Business acquisitions adjustment, reduce in goodwill |  | (400,000) |
Business acquisitions adjustment, increase in deferred tax asset |  | $ 400,000 |
Mexican Subsidiary |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of Noncontrolling interest in subsidiary | 51.00% |  |

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