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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2013 Office Country | Jul. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Oct. 31, 2013 Office Country | Oct. 31, 2012 | Apr. 30, 2013
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of offices | 87 |  |  |  | 87 |  |
Number of countries in which entity operates | 37 |  |  |  | 37 |  |
Investments in affiliated companies maximum | 50.00% |  |  |  | 50.00% |  |
Restricted cash | $ 0 |  |  |  | $ 0 |  | $ 2,900,000
Realized loss of other-than-temporary impairment | 0 |  | 0 |  | 0 | 0 |
Acquisition of a business, contingent consideration |  |  |  |  | 15,000,000 |  |
Impairment of goodwill |  |  |  |  | 0 |  | 0
Impairment of intangible assets |  |  |  |  | 0 |  | 0
Performance related bonus expenses |  |  |  |  | 68,200,000 | 54,000,000 |
(Decrease) increase in performance related bonus expenses |  | (700,000) |  | (200,000) |  |  |
Performance related bonus after reduction in the previous year estimate | 37,000,000 |  | 27,400,000 |  | 67,500,000 | 53,800,000 |
PDI Ninth House |  |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Acquisition of a business, contingent consideration |  |  |  |  | $ 15,000,000 |  |
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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