Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Segment information
Net sales	$ 1,150,551	$ 812,856	$ 2,192,627	$ 1,615,429
Gross Profit	371,870	265,071	707,703	525,529
Depreciation and Amortization	29,403	27,245	57,117	54,342
Adjusted EBITDA	149,539	82,522	277,618	165,576
Geographic divisions
Segment information
Net sales	1,140,652	805,074	2,173,040	1,599,546
Gross Profit	367,920	262,534	700,605	520,372
Depreciation and Amortization	28,990	26,783	56,418	53,565
Adjusted EBITDA	147,923	82,169	274,940	164,673
Other
Segment information
Net sales	9,899	7,782	19,587	15,883
Gross Profit	3,950	2,537	7,098	5,157
Depreciation and Amortization	88	91	176	182
Adjusted EBITDA	1,616	353	2,678	903
Corporate
Segment information
Net sales	0	0	0	0
Gross Profit	0	0	0	0
Depreciation and Amortization	325	371	523	595
Adjusted EBITDA	$ 0	$ 0	$ 0	$ 0