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Accounts Receivable (Detail) - USD ($) $ in Thousands | Oct. 29, 2017 | Apr. 30, 2017 | Oct. 30, 2016 | May 01, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Customers | $ 25,593 | $ 26,211 |  | $ 20,580 |
Accounts receivable, net | 24,220 | 24,577 | [1] | 19,039 |
Allowance for doubtful accounts [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Valuation allowance, balance | (374) | (414) |  | (420) | $ (1,088)
Reserve for returns and allowances and discounts [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Valuation allowance, balance | $ (999) | $ (1,220) |  | $ (1,121) | $ (962)
[1] | Derived from audited financial statements.

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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