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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jan. 31, 2021 USD ($) | Jan. 31, 2020 USD ($) Facility | Jan. 31, 2021 USD ($) Segment | Jan. 31, 2020 USD ($) | Apr. 30, 2020 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of line of business | Segment |  |  |  | 4 |  |
Credit loss for available for sales debt securities |  | $ 0 | $ 0 | $ 0 | $ 0 |
ROU assets, impairment charge |  |  | 2,282,000 |  | 2,282,000 |
Write-off of long-lived assets |  |  |  |  | 2,654,000 |
Impairment of long-lived assets |  | 0 |  | 0 |  | $ 0
Goodwill |  | 625,549,000 |  | 625,549,000 |  | 613,943,000
Impairment of goodwill | $ 0 |  |  |  |  |
Performance-related bonus expenses |  | $ 68,400,000 | $ 60,500,000 | $ 200,400,000 | $ 177,900,000 |
ASU 2016-13 |  |  |  |  |  |
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, 2020 |  | May 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect |  | true |  | true |  |
ASU 2017-04 |  |  |  |  |  |
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, 2020 |  | May 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect |  | true |  | true |  |
ASU 2018-13 |  |  |  |  |  |
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, 2020 |  | May 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect |  | true |  | true |  |
ASU 2018-15 |  |  |  |  |  |
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, 2020 |  | May 01, 2020 |  |
Change in accounting principle, accounting standards update, immaterial effect |  | true |  | true |  |
ASU 2019-12 |  |  |  |  |  |
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, 2020 |  | May 01, 2020 |  |
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 |  |
Consulting | Operating Segments |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 173,000,000.0
Acquired Companies |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Business acquisitions adjustment, increase in goodwill |  |  |  | $ 2,600,000 |  |
Number of office leases closed | Facility |  |  | 16 |  |  |
ROU assets, impairment charge |  |  | $ 2,300,000 |  |  |
Acquired Companies | Leasehold Improvements and Furniture and Fixtures |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Write-off of long-lived assets |  |  | $ 400,000 |  |  |
Affiliated Entity |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Investments in affiliated companies maximum |  | 50.00% |  | 50.00% |  |
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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