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Organization And Summary Of Significant Accounting Policies (Detail) (USD $) | 12 Months Ended
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Apr. 30, 2012 Year | Apr. 30, 2011 | Apr. 30, 2010
Organization and Accounting Policies Disclosure [Line Items] |  |  |
Number of offices | 76 |  |
Number of countries | 35 |  |
Investments in affiliated companies maximum | 50.00% |  |
Dividends received from unconsolidated subsidiary | $ 1,669,000 | $ 1,608,000 | $ 958,000
Restricted cash | 10,000,000 | 10,000,000 |
Realized loss of other-than-temporary impairment | 0 | 0 | 0
Reduction in the estimated fair value of contingent consideration relating to prior acquisition | 2,196,000 | 4,919,000 |
Impairment of goodwill | 0 | 0 |
Intangible assets, estimated useful life, minimum (years) | 3 |  |
Intangible assets, estimated useful life, maximum (years) | 24 |  |
Trademark written-off |  | 880,000 |
Performance related bonus expenses | 116,800,000 | 128,300,000 | 76,900,000
Decrease in performance related bonus expenses | (1,200,000) | (2,000,000) | (3,600,000)
Performance related bonus after reduction in the previous year estimate | 115,600,000 | 126,300,000 | 73,300,000
Deferred bonuses paid | 5,400,000 | 10,200,000 |
Gross CSV | 151,100,000 | 143,900,000 |
Outstanding policy loans | 73,300,000 | 72,900,000 |
Receivable on insolvency of insurance companies | 35,400,000 | 31,000,000 |
Foreign currency losses, after tax basis | 1,600,000 |  | 2,000,000
Foreign currency gains, after tax basis |  | $ 100,000 |
Other Property And Equipment [Member] |  |  |
Organization and Accounting Policies Disclosure [Line Items] |  |  |
Property and equipment, estimated useful life, minimum (years) | 3 |  |
Property and equipment, estimated useful life, maximum (years) | 10 |  |
Software Development Costs [Member] |  |  |
Organization and Accounting Policies Disclosure [Line Items] |  |  |
Property and equipment, estimated useful life, minimum (years) | 3 |  |
Property and equipment, estimated useful life, maximum (years) | 7 |  |

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