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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jul. 31, 2018 | Jul. 31, 2017 | Apr. 30, 2018 | May 01, 2018
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Investments in affiliated companies maximum | 50.00% |  |  |
Impairment of goodwill | $ 0 |  | $ 0 |
Impairment of intangible assets | 0 |  | $ 0 |
Purchase price allocated to indefinite lived trade name intangible assets | 106,600,000 |  |  |
Performance related bonus expenses | 61,000,000 | $ 41,600,000 |  |
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 |  |  |
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 |  |  |
Other Income | Accounting Standards Update 2017-07 |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Reclassification adjustment revised amount | (200,000) |  |  |
Interest Expense | Accounting Standards Update 2017-07 |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Reclassification adjustment revised amount | $ (1,000,000) |  |  |
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 |  |  |
Mexico Subsidiary |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Percentage of Noncontrolling interest in subsidiary | 51.00% |  |  |

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