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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, 2023 USD ($) | Jan. 31, 2022 USD ($) | Jan. 31, 2023 USD ($) | Jan. 31, 2022 USD ($) | Jan. 31, 2023 USD ($) segment business | Jan. 31, 2022 USD ($) | Apr. 30, 2022 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of business segments | segment |  |  |  |  | 8 |  |
Number of line of business | business |  |  |  |  | 5 |  |
Credit loss for available for sales debt securities | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |
Impairment of right-of-use assets |  |  | 5,471,000 | 0 | 5,471,000 | 7,392,000 |
Impairment of fixed assets |  |  | 4,375,000 | 0 | 4,375,000 | 1,915,000 |
Impairment of intangible assets |  |  |  |  | 0 |  | $ 0
Impairment of goodwill | $ 0 | $ 0 |  |  | 0 |  | $ 0
Performance-related bonus expenses |  |  | 94,100,000 | $ 117,700,000 | 295,800,000 | 332,900,000 |
Right-Of-Use Assets |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Impairment of right-of-use assets |  |  | 5,500,000 |  | 5,500,000 | 7,400,000 |
Leasehold Improvements And Furniture And Fixtures |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Impairment of fixed assets |  |  | $ 4,400,000 |  | $ 4,400,000 | $ 1,900,000 |
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 |  |
Mexican Subsidiary |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of noncontrolling interest in subsidiary | 51.00% |  | 51.00% |  | 51.00% |  |

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