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Summary of Net Assets Acquired (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2016
Jan. 31, 2016
Dec. 01, 2015
Apr. 30, 2015
Business Acquisition [Line Items]        
Goodwill $ 575,112 $ 575,112   $ 254,440
Integration/acquisition costs $ 21,147 33,815    
Legacy Hay        
Business Acquisition [Line Items]        
Receivables due from clients     $ 116,509  
Other current assets     16,306  
Property and equipment     27,904  
Intangibles assets [1]     198,700  
Other non-current assets     7,345  
Current liabilities     127,099  
Deferred compensation and other retirement plans     31,400  
Deferred tax liabilities     55,369  
Other liabilities     9,118  
Net assets acquired     143,778  
Purchase price     470,502  
Goodwill     $ 326,724  
Integration/acquisition costs   $ 33,815    
[1] Acquisition-related intangible assets acquired in connection with the acquisition of Legacy Hay consist of customer lists and intellectual property of $86.3 million and $10.2 million, respectively, with weighted-average useful lives from the date of purchase of eleven years and seven years, respectively. Acquisition-related intangible assets not subject to amortization acquired in connection with the acquisition of Legacy Hay consist of trademarks of $102.2 million.