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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) | Oct. 31, 2019 USD ($) Segment | Oct. 31, 2018 USD ($) | Apr. 30, 2019 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of business segments | Segment |  |  | 3 |  |
Impairment of goodwill |  |  | $ 0 |  | $ 0
Impairment of intangible assets |  |  | 0 |  | $ 0
Purchase price allocated to indefinite lived trade name intangible assets |  | $ 106,600,000 |  | $ 106,600,000 |
Performance-related bonus expenses | $ 64,400,000 | $ 81,900,000 | 117,400,000 | 142,900,000 |
Accounting Standards Update 2016-02 |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
ROU assets | 236,100,000 |  | 236,100,000 |  |
Lease liability | $ 272,300,000 |  | 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 |  |
General and Administrative Expenses |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of intangible assets |  |  |  | $ 106,600,000 |
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 |  |
Affiliated Entity |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Investments in affiliated companies maximum | 50.00% |  | 50.00% |  |
Mexico Subsidiary |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of Noncontrolling interest in subsidiary | 51.00% |  | 51.00% |  |

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