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Receivables (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	May 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, allowance for doubtful account, net	$ 2,754	$ 3,942
Accounts receivable	101,099	67,808
Financing receivable	4,288	3,097
Retainage on construction-type contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,834	660
Financing receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Long-term receivables	$ 4,364	$ 3,438
Financing receivable | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables, annual interest rates	0.00%
Financing receivable | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract receivables, annual interest rates	9.00%

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The interest rate of contract and leases receivable.

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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