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Accounts Receivable (Detail) - USD ($)
$ in Thousands

Jan. 27, 2019

Apr. 30, 2018

Apr. 29, 2018

Jan. 28, 2018

Apr. 30, 2017

Accounts, Notes, Loans and Financing Receivable [Line Items]

Customers

$ 26,748

$ 28,097

$ 27,666

Accounts receivable, net

26,142

$ 27,452

26,307

^[1]

26,097

Allowance for doubtful accounts [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Valuation allowance, balance

(388)

(357)

(357)

$ (414)

Allowance for cash discounts [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Valuation allowance, balance

(197)

(245)

(222)

Allowance for sales returns and allowances [Member]

Accounts, Notes, Loans and Financing Receivable [Line Items]

Valuation allowance, balance

^[2]

$ (21)

$ (1,188)

$ (990)

[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.

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(5))
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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