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Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Apr. 30, 2016
Segment information          
Total assets $ 1,394,727   $ 1,394,727   $ 1,240,814
Net sales 562,523 $ 420,482 1,704,169 $ 1,331,000  
Gross profit 185,727 134,160 557,536 418,961  
Depreciation and amortization 18,316 16,009 51,479 47,336  
Geographic divisions          
Segment information          
Net sales 557,774 416,706 1,689,407 1,320,242  
Gross profit 183,503 132,730 551,788 414,816  
Geographic divisions | Adjustment | Segment misclassification          
Segment information          
Net sales       11,289  
Other          
Segment information          
Net sales 4,749 3,776 14,762 10,758  
Gross profit 2,224 1,430 5,748 4,145  
Other | Adjustment | Segment misclassification          
Segment information          
Net sales       (11,289)  
Operating Segment          
Segment information          
Adjusted EBITDA 40,678 25,688 136,138 94,601  
Operating Segment | Geographic divisions          
Segment information          
Depreciation and amortization 18,018 15,744 50,597 46,480  
Adjusted EBITDA 39,910 25,532 134,706 94,120  
Operating Segment | Geographic divisions | Adjustment | Segment reporting revision          
Segment information          
Depreciation and amortization       (638)  
Operating Segment | Other          
Segment information          
Depreciation and amortization 77 72 236 218  
Adjusted EBITDA 768 156 1,432 481  
Corporate          
Segment information          
Depreciation and amortization $ 221 $ 193 $ 646 638  
Corporate | Adjustment | Segment reporting revision          
Segment information          
Depreciation and amortization       $ 638