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Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
Segment information                      
Net sales $ 614,977 $ 562,523 $ 591,846 $ 549,800 $ 527,182 $ 420,482 $ 458,077 $ 452,441 $ 2,319,146 $ 1,858,182 $ 1,570,085
Gross profit 201,035 $ 185,727 $ 193,224 $ 178,585 174,203 $ 134,160 $ 143,913 $ 140,888 758,571 593,164 478,971
Depreciation and amortization                 69,240 64,215 64,165
Total assets 1,393,265       1,240,814       1,393,265 1,240,814 1,160,976
Geographic divisions                      
Segment information                      
Net sales                 2,298,871 1,842,634 1,558,209
Gross profit                 750,564 587,213 474,363
Other                      
Segment information                      
Net sales                 20,275 15,548 11,876
Gross profit                 8,007 5,951 4,608
Operating Segment                      
Segment information                      
Adjusted EBITDA                 188,229 138,183 105,796
Operating Segment | Geographic divisions                      
Segment information                      
Depreciation and amortization                 68,001 63,093 63,136
Adjusted EBITDA                 186,155 137,459 105,247
Total assets 1,376,655       1,217,871       1,376,655 1,217,871 1,143,637
Operating Segment | Other                      
Segment information                      
Depreciation and amortization                 310 295 288
Adjusted EBITDA                 2,074 724 549
Total assets 11,916       12,310       11,916 12,310 10,421
Corporate                      
Segment information                      
Depreciation and amortization                 929 827 741
Total assets $ 4,694       $ 10,633       $ 4,694 $ 10,633 $ 6,918