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Acquisition - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 01, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Nov. 23, 2015 | Apr. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock, par value |  | $ 0.01 |  | $ 0.01 |  |  | $ 0.01
Fee revenue |  | $ 344,158,000 | $ 249,545,000 | $ 892,152,000 | $ 756,435,000 |  |
Assets |  | 1,873,300,000 |  | 1,873,300,000 |  |  | $ 1,317,801,000
Adjusted EBITDA |  | 47,691,000 | $ 39,068,000 | 135,424,000 | $ 120,969,000 |  |
Term Facility |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Senior unsecured loan, aggregate principal amount |  |  |  |  |  | $ 150,000,000 |
Legacy Hay |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, aggregate purchase price | $ 470,500,000 |  |  |  |  |  |
Payment to acquire business | $ 252,600,000 |  |  |  |  |  |
Business combination, Consideration Shares | 5,922,136 |  |  |  |  |  |
Business combination, Consideration Shares value | $ 217,900,000 |  |  |  |  |  |
Common stock, par value | $ 0.01 |  |  |  |  |  |
Business combination, committed to retention pool for certain employees | $ 40,000,000 |  |  |  |  |  |
Business combination, committed to retention pool for certain employees, payable | $ 5,000,000 |  |  |  |  |  |
Fee revenue |  | 71,900,000 |  |  |  |  |
Assets |  | 746,100,000 |  | $ 746,100,000 |  |  |
Adjusted EBITDA |  | $ 8,600,000 |  |  |  |  |
Adjusted EBITDA margin |  | 11.00% |  |  |  |  |
Legacy Hay | Payable within 45 days after November 30, 2017 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, committed to retention pool for certain employees | 50.00% |  |  |  |  |  |
Legacy Hay | Payable within 45 days after November 30, 2018 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination, committed to retention pool for certain employees | 50.00% |  |  |  |  |  |
Foreign Locations | Legacy Hay |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payment to acquire business | $ 54,000,000 |  |  |  |  |  |

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