Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Segment information
Net sales	$ 1,042,076	$ 802,573
Gross Profit	335,833	260,458
Depreciation and Amortization	27,714	27,097
Adjusted EBITDA	128,079	83,054
Geographic divisions
Segment information
Net sales	1,032,388	794,472
Gross Profit	332,685	257,838
Depreciation and Amortization	27,428	26,782
Adjusted EBITDA	127,017	82,503
Other
Segment information
Net sales	9,688	8,101
Gross Profit	3,148	2,620
Depreciation and Amortization	88	91
Adjusted EBITDA	1,062	551
Corporate
Segment information
Net sales	0	0
Gross Profit	0	0
Depreciation and Amortization	198	224
Adjusted EBITDA	$ 0	$ 0