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Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Apr. 30, 2016
Segment information      
Net sales $ 549,800 $ 452,441  
Gross profit 178,585 140,888  
Depreciation and amortization 15,795 16,065  
Total assets 1,281,996   $ 1,240,814
Geographic divisions      
Segment information      
Net sales 545,005 449,005  
Gross profit 176,840 139,580  
Other      
Segment information      
Net sales 4,795 3,436  
Gross profit 1,745 1,308  
Other | Revision | Segment misclassification      
Segment information      
Net sales   3,937  
Operating Segment      
Segment information      
Adjusted EBITDA 45,941 34,113  
Operating Segment | Geographic divisions      
Segment information      
Depreciation and amortization 15,507 15,749  
Adjusted EBITDA 45,608 33,942  
Total assets 1,264,762    
Operating Segment | Other      
Segment information      
Depreciation and amortization 80 73  
Adjusted EBITDA 333 171  
Total assets 11,787    
Corporate      
Segment information      
Depreciation and amortization 208 243  
Total assets $ 5,447    
Corporate | Revision | Segment misclassification      
Segment information      
Depreciation and amortization   $ 243