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Acquisitions - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Jan. 09, 2015
Dec. 11, 2014
May. 05, 2014
Jul. 31, 2015
Apr. 30, 2015
Business Acquisition [Line Items]          
Goodwill deductible for tax purpose       $ 12,000,000  
DRP Acquisition          
Business Acquisition [Line Items]          
Payments to acquire business, excluding working capital adjustment     $ 22,800,000    
Working capital adjustment     1,000,000    
Payments to acquire business, net of cash acquired     $ 23,800,000    
BTI Acquisition          
Business Acquisition [Line Items]          
Payments to acquire business, excluding working capital adjustment   $ 130,500,000      
Working capital adjustment   3,100,000      
Payments to acquire business, net of cash acquired       135,500,000  
Acquisition payment made through line of credit   100,000,000      
Increase in goodwill       $ 631,000  
Business combination, acquisition-related costs         $ 1,700,000
B T I Acquisition Excluding Hooyman Llc          
Business Acquisition [Line Items]          
Payments to acquire business, net of cash acquired   $ 133,600,000      
Hooyman LLC          
Business Acquisition [Line Items]          
Payments to acquire business, net of cash acquired $ 1,900,000