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Revenue - Effect of adopting ASC 606 (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 28, 2018 | Oct. 29, 2017 | Oct. 28, 2018 | Oct. 29, 2017 | Apr. 30, 2018 | Apr. 29, 2018
Assets: |  |  |  |  |  |  |  |
Accounts Receivable |  | $ 24,362 | $ 24,220 | $ 24,362 | $ 24,220 | $ 27,452 | $ 26,307 | [1]
Other current assets |  | 2,461 | 2,263 | 2,461 | 2,263 | 2,897 | 2,870 | [1]
Liabilities: |  |  |  |  |  |  |  |
Accrued expenses |  | 8,670 | 7,364 | 8,670 | 7,364 | 10,497 | 9,325 | [1]
Statements of Net Income |  |  |  |  |  |  |  |
Net sales |  | 77,006 | 80,698 | 148,479 | 160,230 |  |  |
Cost of sales |  | 63,680 | $ 64,894 | 124,594 | $ 127,962 |  |  |
Accounting Standards Update 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Accounts Receivable |  | 23,268 |  | 23,268 |  |  | 26,307 |
Other current assets |  | 2,431 |  | 2,431 |  |  | 2,870 |
Liabilities: |  |  |  |  |  |  |  |
Accrued expenses |  | 7,546 |  | 7,546 |  |  | $ 9,325 |
Statements of Net Income |  |  |  |  |  |  |  |
Net sales |  | 77,016 |  | 148,449 |  |  |  |
Cost of sales |  | 63,690 |  | 124,564 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Adjustments Due to ASC 606 Adoption [Member] |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Accounts Receivable | [2] | (1,094) |  | (1,094) |  | 1,145 |  |
Other current assets | [2] | (30) |  | (30) |  | 27 |  |
Liabilities: |  |  |  |  |  |  |  |
Accrued expenses | [2] | (1,124) |  | (1,124) |  | $ 1,172 |  |
Statements of Net Income |  |  |  |  |  |  |  |
Net sales | [2] | 10 |  | (30) |  |  |  |
Cost of sales | [2] | $ 10 |  | $ (30) |  |  |  |
[1] | Derived from audited financial statements.
[2] | The adjustments associated with the adoption of the new standard are related to classifying allowances for estimated sales returns as a liability rather than as a contra account to accounts receivable on the consolidated balance sheet for the current year's presentation only. As required under the new standard, we also recorded the estimated allowance for sales returns on a gross basis rather than a net basis by separately reflecting a return goods asset within other current assets rather than netting such amounts with the estimated sales returns liability.

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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 Reference 2: 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 + Details
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