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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, 2019 USD ($) | Jan. 31, 2018 USD ($) | Jan. 31, 2019 USD ($) Segment | Jan. 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | May 01, 2018 USD ($)
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 |  | $ 0 |
Purchase price allocated to indefinite lived trade name intangible assets | 106,600,000 |  | 106,600,000 |  |  |
Performance-related bonus expenses | 59,500,000 | $ 56,800,000 | 202,400,000 | $ 155,200,000 |  |
Accounting Standards Update 2014-09 | Adjustments Due to ASC 606 |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to retained earnings, net of tax |  |  |  |  |  | $ 6,700,000
Accounting Standards Update 2018-02 |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Increase to retained earnings, net of tax | $ 2,200,000 |  | 2,200,000 |  |  |
General and Administrative Expenses |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment of intangible assets |  |  | $ 106,600,000 |  |  |
Compensation Expense | Accounting Standards Update 2017-07 |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Reclassification adjustment revised amount |  | 1,200,000 |  | 3,600,000 |  |
Other Income | Accounting Standards Update 2017-07 |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Reclassification adjustment revised amount |  | (200,000) |  | (500,000) |  |
Interest Expense | Accounting Standards Update 2017-07 |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Reclassification adjustment revised amount |  | $ (1,000,000) |  | $ (3,100,000) |  |
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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