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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |
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Apr. 30, 2019 USD ($) | Apr. 30, 2019 USD ($) Segment | Apr. 30, 2018 USD ($) Segment | Apr. 30, 2017 USD ($) | May 01, 2018 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of business segments | Segment |  | 3 | 3 |  |
Dividends received from unconsolidated subsidiary |  | $ 140,000 | $ 240,000 | $ 564,000 |
Impairment of long-lived assets |  | 0 | 0 | 0 |
Impairment of goodwill | $ 0 |  |  |  |
Purchase price allocated to indefinite lived trade name intangible assets | 106,600,000 | 106,600,000 |  |  |
Performance related bonus expenses |  | $ 257,300,000 | 220,400,000 | 179,600,000 |
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 | 126,000,000 | $ 126,000,000 | 120,087,000 |  |
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
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 | $ 126,000,000 | 126,000,000 | 120,100,000 |  |
General and Administrative Expenses |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Impairment of intangible assets |  | 106,600,000 |  |  |
Foreign currency gains (losses) |  | $ (1,700,000) | (3,300,000) | 300,000 |
Compensation Expense | Accounting Standards Update 2017-07 |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Reclassification adjustment revised amount |  |  | 4,600,000 | 5,800,000 |
Other Income | Accounting Standards Update 2017-07 |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Reclassification adjustment revised amount |  |  | (400,000) | (1,500,000) |
Interest Expense | Accounting Standards Update 2017-07 |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Reclassification adjustment revised amount |  |  | $ (4,200,000) | $ (4,400,000) |
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 |  |  |
Mexico Subsidiary |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of Noncontrolling interest in subsidiary | 51.00% | 51.00% |  |  |
Affiliated Entity |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Investments in affiliated companies maximum | 50.00% | 50.00% |  |  |

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