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Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Apr. 30, 2016
Segment information          
Total assets $ 1,414,713   $ 1,414,713   $ 1,240,814
Net sales 591,846 $ 458,077 1,141,646 $ 910,518  
Gross profit 193,224 143,913 371,809 284,801  
Depreciation and amortization 17,368 15,262 33,163 31,327  
Geographic divisions          
Segment information          
Net sales 586,628 454,531 1,131,633 903,536  
Gross profit 191,445 142,506 368,285 282,086  
Other          
Segment information          
Net sales 5,218 3,546 10,013 6,982  
Gross profit 1,779 1,407 3,524 2,715  
Other | Adjustment | Segment misclassification          
Segment information          
Net sales       7,754  
Operating Segment          
Segment information          
Adjusted EBITDA 49,519 34,800 95,460 68,913  
Operating Segment | Geographic divisions          
Segment information          
Total assets 1,396,505   1,396,505    
Depreciation and amortization 17,072 14,987 32,579 30,736  
Adjusted EBITDA 49,188 34,646 94,796 68,588  
Operating Segment | Geographic divisions | Adjustment | Segment reporting revision          
Segment information          
Depreciation and amortization       (445)  
Operating Segment | Other          
Segment information          
Total assets 12,798   12,798    
Depreciation and amortization 79 73 159 146  
Adjusted EBITDA 331 154 664 325  
Operating Segment | Other | Adjustment | Segment misclassification          
Segment information          
Net sales       (7,754)  
Corporate          
Segment information          
Total assets 5,410   5,410    
Depreciation and amortization $ 217 $ 202 $ 425 445  
Corporate | Adjustment | Segment reporting revision          
Segment information          
Depreciation and amortization       $ 445