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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2022 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2022 USD ($) Segment | Jan. 31, 2021 USD ($) | Apr. 30, 2021 USD ($) | Jan. 31, 2020 USD ($)
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 |  |  | $ 0
Impairment of right of use assets |  |  | 7,392,000 |  |  |
Impairment of fixed assets |  |  | 1,915,000 |  |  |
Impairment of long-lived assets |  | $ 0 |  | $ 0 |  |
Impairment of goodwill |  |  | 0 |  |  |
Impairment of intangible assets |  |  | 0 |  | $ 0 |
Performance-related bonus expenses | $ 117,700,000 | $ 68,400,000 | $ 332,900,000 | 200,400,000 |  |
ASU 2021-01 |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Change in accounting principle, accounting standards update, adopted | true |  | true |  |  |
Change in accounting principle, accounting standards update, adoption date | May 01, 2021 |  | May 01, 2021 |  |  |
Change in accounting principle, accounting standards update, immaterial effect | true |  | 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 |  |  |
Leasehold Improvements and Furniture and Fixtures |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment of fixed assets |  |  | $ 1,900,000 |  |  |
Acquired Companies |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Business acquisitions adjustment, increase in goodwill |  |  |  | $ 2,600,000 |  |
Mexican Subsidiary |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of Noncontrolling interest in subsidiary | 51.00% |  | 51.00% |  |  |

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