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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2017 USD ($) Country Office | Jan. 31, 2016 USD ($) | Jan. 31, 2017 USD ($) Country Office | Jan. 31, 2016 USD ($) | 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 | $ 99,700,000 |  | $ 99,700,000 |  | $ 95,900,000 |
Increase (Decrease) in income taxes payable |  |  | (3,500,000) | $ (4,243,000) |  |
Impairment of goodwill |  |  | 0 |  | 0 |
Impairment of intangible assets |  |  | 0 |  | $ 0 |
Performance related bonus expenses | 41,100,000 | $ 41,100,000 | $ 136,200,000 | $ 127,500,000 |  |
Legacy Hay |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Decrease in goodwill | (4,600,000) |  |  |  |  |
Increase (Decrease) in income taxes payable | 1,800,000 |  |  |  |  |
Increase in deferred tax assets | $ 6,300,000 |  |  |  |  |
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
Mexican Subsidiary |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of Noncontrolling interest in subsidiary |  |  |  |  | 51.00% |
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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