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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.