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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2014 Office Country | Jul. 31, 2013 | Apr. 30, 2014
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of offices | 84 |  |
Number of countries in which entity operates | 37 |  |
Investments in affiliated companies maximum | 50.00% |  |
Deferred revenue | $ 38,300,000 |  | $ 36,800,000
Cash equivalents | 104,400,000 |  | 186,600,000
Realized loss of other-than-temporary impairment | 0 | 0 |
Payment of contingent consideration from acquisitions |  | 15,000,000 |
Impairment of goodwill | 0 |  | 0
Impairment of intangible assets | 0 |  | 0
Performance related bonus expenses | 39,000,000 | 31,200,000 |
(Decrease) increase in performance related bonus expenses | (300,000) | (700,000) |
Performance related bonus after reduction in the previous year estimate | $ 38,700,000 | $ 30,500,000 |
Minimum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful lives | 2 years |  |
Maximum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Intangible assets estimated useful lives | 24 years |  |

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