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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2017 | Jul. 31, 2016 | Apr. 30, 2017
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Investments in affiliated companies maximum | 50.00% |  |
Deferred revenue | $ 93,600,000 |  | $ 95,800,000
Impairment of goodwill | 0 |  | 0
Impairment of intangible assets | 0 |  | $ 0
Performance related bonus expenses | 41,600,000 | $ 42,400,000 |
Net cash from operations | (109,573,000) | (135,706,000) |
Net cash provided by financing | $ (15,266,000) | 126,290,000 |
Adjustments for New Accounting Pronouncement |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Net cash from operations |  | 300,000 |
Net cash provided by financing |  | $ (300,000) |
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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