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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Apr. 30, 2015 USD ($) Country Office | Apr. 30, 2014 USD ($) | Apr. 30, 2013 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% |  |
Dividends received from unconsolidated subsidiary | $ 1,656,000 | $ 2,120,000 | $ 1,897,000
Deferred revenue | 40,500,000 | 36,800,000 |
Cash equivalents | 260,600,000 | 186,600,000 |
Realized loss of other-than-temporary impairment | 0 | 0 | 0
Payment of contingent consideration from acquisitions |  | 15,000,000 |
Impairment Charges | 0 | 0 | 0
Impairment of goodwill | 0 |  |
Impairment of intangible assets | 0 | 0 |
Performance related bonus expenses | 166,700,000 | 146,100,000 | 114,100,000
(Decrease) increase in performance related bonus expenses | (300,000) | (700,000) | (200,000)
Performance related bonus after reduction in the previous year estimate | 166,400,000 | 145,400,000 | 113,900,000
Foreign currency losses/(gains), after tax | $ 1,600,000 | (1,000,000) | $ 500,000
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 |  |
Csv Of Coli Contracts |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Gross CSV | $ 172,300,000 | 167,200,000 |
Outstanding policy loans | 69,600,000 | 72,900,000 |
Receivable on insolvency of insurance companies | $ 50,600,000 | $ 45,900,000 |
Executive Capital Accumulation Plan |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Deferred compensation arrangement vesting period | 4 years |  |
Software and Software Development Costs | Minimum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful life, maximum | 3 years |  |
Software and Software Development Costs | Maximum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful life, maximum | 7 years |  |
Other Capitalized Property Plant and Equipment | Minimum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful life, maximum | 3 years |  |
Other Capitalized Property Plant and Equipment | Maximum |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful life, maximum | 10 years |  |

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