Segments - Net Sales, Adjusted EBITDA and Certain Other Measures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Segment information
Net sales	$ 751,191	$ 761,352	$ 2,366,620	$ 2,470,457
Gross Profit	243,324	253,473	768,853	811,620
Depreciation and Amortization	25,562	29,422	79,904	88,215
Adjusted EBITDA	62,587	62,697	228,163	236,190
Geographic divisions
Segment information
Net sales	741,885	754,916	2,341,430	2,449,926
Gross Profit	240,536	251,086	760,908	804,340
Depreciation and Amortization	24,942	28,791	78,507	86,747
Adjusted EBITDA	61,916	62,169	226,588	234,422
Other.
Segment information
Net sales	9,306	6,436	25,190	20,531
Gross Profit	2,788	2,387	7,945	7,280
Depreciation and Amortization	92	56	274	164
Adjusted EBITDA	671	528	1,575	1,768
Corporate
Segment information
Depreciation and Amortization	$ 528	$ 575	$ 1,123	$ 1,304