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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 USD ($) Country Office | Jul. 31, 2015 USD ($) | Apr. 30, 2016 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of offices | Office | 128 |  |
Number of countries in which entity operates | Country | 52 |  |
Investments in affiliated companies maximum | 50.00% |  |
Deferred revenue | $ 88,900,000 |  | $ 95,900,000
Impairment of goodwill | 0 |  | 0
Impairment of intangible assets | 0 |  | $ 0
Performance related bonus expenses | 42,400,000 | $ 41,800,000 |
Accounting Standards Update 2015-03 | Restatement Adjustment |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Unamortized debt issuance costs | 4,200,000 |  |
Unamortized debt issuance costs, current | 900,000 |  |
Unamortized debt issuance costs, non-current | $ 3,300,000 |  |
Minimum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful lives | 1 year |  |
Maximum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful lives | 24 years |  |

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