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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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Number of shares of equity interests issued or issuable to acquire entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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