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Summary of Acquisition (Parenthetical) (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 01, 2015 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016 | Nov. 23, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 |  |
Fee revenue |  |  | $ 475,364,000 | $ 447,581,000 | $ 443,018,000 | $ 401,254,000 | $ 406,065,000 | $ 381,918,000 | $ 401,917,000 | $ 375,621,000 | $ 1,767,217,000 | $ 1,565,521,000 | $ 1,292,112,000 |
Assets | [1] |  | $ 2,287,914,000 |  |  |  | $ 2,062,898,000 |  |  |  | 2,287,914,000 | 2,062,898,000 | 1,898,600,000 |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  | 273,802,000 | 234,976,000 | 190,229,000 |
Legacy Hay |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination, aggregate purchase price |  | $ 476,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  | $ 259,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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, paid |  |  |  |  |  |  |  |  |  |  | $ 14,500,000 | $ 9,000,000 |  |
Business combination, committed to retention pool for certain employees balance payable description |  |  |  |  |  |  |  |  |  |  | The remaining balance will be payable within 45 days after November 30, 2018. |  |  |
Fee revenue |  |  |  |  |  |  |  |  |  |  |  |  | 186,800,000 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  | 740,200,000 |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  |  | $ 28,500,000 |
Adjusted EBITDA margin |  |  |  |  |  |  |  |  |  |  |  |  | 14.40% |
Foreign Locations | Legacy Hay |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment to acquire business |  | $ 54,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured loan, aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000
[1] | As of the end of the fiscal year.

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