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Accounts Receivable (Detail) - USD ($) $ in Thousands		Apr. 28, 2019	Apr. 30, 2018	Apr. 29, 2018	Apr. 30, 2017	May 01, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
customers		$ 24,370		$ 28,097
Accounts receivable, net		23,751	$ 27,452	26,307
allowance for doubtful accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance		(393)		(357)	$ (414)	$ (1,088)
allowance for cash discounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance		(186)		(245)
Allowance for sales returns and allowances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Valuation allowance, balance	[1]	$ (40)		$ (1,188)
[1] 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 4 to the consolidated financial statements for required balance sheet disclosures associated with the adoption of ASC Topic 606.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
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Amount 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, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045

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Amount of valuation and qualifying accounts and reserves.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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