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Accounts Receivable (Detail) - USD ($) $ in Thousands | Jul. 29, 2018 | Apr. 30, 2018 | Apr. 29, 2018 | Jul. 30, 2017 | Apr. 30, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Customers |  | $ 23,793 |  | $ 28,097 |  | $ 23,548 |
Accounts receivable, net |  | 23,225 | $ 27,452 | 26,307 | [1] | 22,140 |
Allowance for doubtful accounts [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Valuation allowance, balance |  | (366) |  | (357) |  | (325) | $ (414)
Allowance for cash discounts [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Valuation allowance, balance |  | (150) |  | (245) |  | (238) |
Allowance for sales returns and allowances [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Valuation allowance, balance | [2] | $ (52) |  | $ (1,188) |  | $ (845) |
[1] | Derived from audited financial statements.
[2] | Due to the adoption of ASC Topic 606, Revenue from Contracts with Customers, certain balance sheet reclassifications were required regarding our allowance for sales returns and allowances for the current year's presentation only. See Note 5 to the consolidated financial statements for required balance sheet disclosures associated with the adoption of ASC Topic 606.

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