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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2016 USD ($) Country Office | Oct. 31, 2015 USD ($) | Oct. 31, 2016 USD ($) Country Office | Oct. 31, 2015 USD ($) | Apr. 30, 2016 USD ($) | Jul. 31, 2016 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of offices | Office | 128 |  | 128 |  |  |
Number of countries in which entity operates | Country | 52 |  | 52 |  |  |
Investments in affiliated companies maximum | 50.00% |  | 50.00% |  |  |
Deferred revenue | $ 88,400,000 |  | $ 88,400,000 |  | $ 95,900,000 |
Impairment of goodwill |  |  | 0 |  | 0 |
Impairment of intangible assets |  |  | 0 |  | $ 0 |
Performance related bonus expenses | $ 52,700,000 | $ 44,600,000 | $ 95,100,000 | $ 86,400,000 |  |
Accounting Standards Update 2015-03 | Restatement Adjustment |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  | $ 4,200,000
Unamortized debt issuance costs, current |  |  |  |  |  | 900,000
Unamortized debt issuance costs, non-current |  |  |  |  |  | $ 3,300,000
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 |  |  |

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