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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
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Oct. 31, 2012 Country | Jul. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Oct. 31, 2012 Segment Country | Oct. 31, 2011 | Apr. 30, 2012
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of offices | 76 |  |  |  | 76 |  |
Number of countries | 35 |  |  |  | 35 |  |
Number of business segments |  |  |  |  | 3 |  |
Investments in affiliated companies maximum | 50.00% |  |  |  | 50.00% |  |
Restricted cash | $ 10.0 |  |  |  | $ 10.0 |  | $ 10.0
Performance related bonus expenses | 27.4 |  | 28.2 |  | 54.0 | 60.9 |
Decrease in performance related bonus expenses |  | (0.2) |  | (1.2) | (0.2) | (1.2) |
Performance related bonus after reduction in the previous year estimate |  |  |  |  | $ 53.8 | $ 59.7 |
Minimum |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible assets estimated useful lives |  |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible assets estimated useful lives |  |  |  |  | 24 years |  |

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