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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2015 USD ($) Country Office | Jul. 31, 2014 USD ($) | Apr. 30, 2015 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of offices | Office | 78 |  |
Number of countries in which entity operates | Country | 37 |  |
Investments in affiliated companies maximum | 50.00% |  |
Deferred revenue | $ 39,500,000 |  | $ 40,500,000
Cash equivalents | 168,800,000 |  | 260,600,000
Realized loss of other-than-temporary impairment | 0 | $ 0 |
Impairment of goodwill | 0 |  | 0
Impairment of intangible assets | 0 |  | $ 0
Performance related bonus expenses | 42,400,000 | 39,000,000 |
(Decrease) increase in performance related bonus expenses | (600,000) | (300,000) |
Performance related bonus after reduction in the previous year estimate | $ 41,800,000 | $ 38,700,000 |
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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