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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Nov. 01, 2019 USD ($) Facility | Apr. 30, 2020 USD ($) Segment Facility | Apr. 30, 2019 USD ($) | Apr. 30, 2018 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of business segments | Segment |  |  | 4 |  |
Dividends received from unconsolidated subsidiary |  |  | $ 346,000 | $ 140,000 | $ 240,000
Other-than-temporary impairment |  |  | 0 | 0 | 0
ROU assets, impairment charge |  |  | 2,282,000 |  |
Write-off of long-lived assets |  |  | 2,654,000 |  |
Impairment of long-lived assets |  |  |  | 0 | 0
Goodwill |  |  | 613,943,000 | 578,298,000 | 584,222,000
Impairment of goodwill | $ 0 |  |  |  |
Impairment of intangible assets |  |  | 0 |  |
Purchase price allocated to indefinite lived trade name intangible assets |  |  |  | 106,600,000 |
Performance-related bonus expenses |  |  | $ 197,100,000 | 257,300,000 | 220,400,000
Percentage that Actuarial gain or loss must exceed the greater of PBO or Market Value Plan Assets |  |  | 10.00% |  |
Cash surrender value of company owned life insurance policies, net of loans |  |  | $ 146,408,000 | 126,000,000 |
Accounting Standards Update 2016-02 |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
ROU assets |  |  | 236,100,000 |  |
Lease liability |  |  | 272,300,000 |  |
ROU asset adjusted by reclassification of pre-existing prepaid expenses and other assets |  |  | 5,100,000 |  |
ROU asset adjusted by reclassification of deferred rent |  |  | 41,300,000 |  |
CSV of COLI Contracts |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash surrender value of company owned life insurance policies, net of loans |  |  | 146,400,000 | 126,000,000.0 |
General and Administrative Expenses |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of intangible assets |  |  |  | 106,600,000 |
Foreign currency gains (losses) |  |  | (4,100,000) | (1,700,000) | (3,300,000)
Consulting | Operating Segments |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill |  |  | $ 173,014,000 | $ 173,147,000 | $ 173,453,000
Acquired Companies |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of office leases closed | Facility |  | 16 | 16 |  |
ROU assets, impairment charge |  | $ 2,300,000 | $ 2,300,000 |  |
Goodwill |  | $ 38,926,000 |  |  |
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 |  |
Minimum | Executive Capital Accumulation Plan |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred compensation arrangement vesting period |  |  | 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 |  |
Maximum | Executive Capital Accumulation Plan |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred compensation arrangement vesting period |  |  | 5 years |  |
Software and Software Development Costs | Minimum |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life |  |  | 3 years |  |
Software and Software Development Costs | Maximum |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life |  |  | 7 years |  |
Other Capitalized Property Plant and Equipment | Minimum |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life |  |  | 3 years |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Property and equipment estimated useful life |  |  | 10 years |  |
Leasehold Improvements And Furniture And Fixtures | Acquired Companies |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Write-off of long-lived assets |  |  | $ 400,000 |  |
Mexican Subsidiary |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of Noncontrolling interest in subsidiary |  |  | 51.00% |  |
Affiliated Entity |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Investments in affiliated companies maximum |  |  | 50.00% |  |

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