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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Apr. 30, 2017
Organization And Summary Of Significant Accounting Policies [Line Items]      
Investments in affiliated companies maximum 50.00%    
Deferred revenue $ 93,600,000   $ 95,800,000
Impairment of goodwill 0   0
Impairment of intangible assets 0   $ 0
Performance related bonus expenses 41,600,000 $ 42,400,000  
Net cash from operations (109,573,000) (135,706,000)  
Net cash provided by financing $ (15,266,000) 126,290,000  
Adjustments for New Accounting Pronouncement      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Net cash from operations   300,000  
Net cash provided by financing   $ (300,000)  
Minimum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Intangible assets estimated useful lives 1 year    
Amortization of long-term retention awards 4 years    
Maximum      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Intangible assets estimated useful lives 24 years    
Amortization of long-term retention awards 5 years    
Mexico Subsidiary      
Organization And Summary Of Significant Accounting Policies [Line Items]      
Percentage of Noncontrolling interest in subsidiary 51.00%