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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Country
Office
Jan. 31, 2016
USD ($)
Jan. 31, 2017
USD ($)
Country
Office
Jan. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Jul. 31, 2016
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]            
Number of offices | Office 128   128      
Number of countries in which entity operates | Country 52   52      
Investments in affiliated companies maximum 50.00%   50.00%      
Deferred revenue $ 99,700,000   $ 99,700,000   $ 95,900,000  
Increase (Decrease) in income taxes payable     (3,500,000) $ (4,243,000)    
Impairment of goodwill     0   0  
Impairment of intangible assets     0   $ 0  
Performance related bonus expenses 41,100,000 $ 41,100,000 $ 136,200,000 $ 127,500,000    
Legacy Hay            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Decrease in goodwill (4,600,000)          
Increase (Decrease) in income taxes payable 1,800,000          
Increase in deferred tax assets $ 6,300,000          
Accounting Standards Update 2015-03 | Restatement Adjustment            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Unamortized debt issuance costs           $ 4,200,000
Unamortized debt issuance costs, current           900,000
Unamortized debt issuance costs, non-current           $ 3,300,000
Mexican Subsidiary            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Percentage of Noncontrolling interest in subsidiary         51.00%  
Minimum            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Intangible assets estimated useful lives     1 year      
Maximum            
Organization And Summary Of Significant Accounting Policies [Line Items]            
Intangible assets estimated useful lives     24 years