Transactions With Related Parties	12 Months Ended
	Apr. 30, 2021
Related Party Transactions [Abstract]
Transactions With Related Parties	Transactions With Related PartiesThe Company purchases inventories from Southern Wall Products, Inc. (“SWP”) on a continuing basis. During the years ended April 30, 2021, 2020 and 2019, certain former executive officers and stockholders and certain directors and stockholders of the Company were stockholders of SWP. As of April 30, 2021, these executive officers and directors were no longer with the Company. The Company purchased inventory from SWP for distribution in the amount of $7.3 million, $14.3 million and $13.3 million during the years ended April 30, 2021, 2020 and 2019, respectively. Amounts due to SWP for purchases of inventory for distribution as of April 30, 2020 were $1.2 million and were included in accounts payable in the Consolidated Balance Sheet.