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Derivatives - Schedule of Gains and Losses on Derivative Instruments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jul. 29, 2018 | Jul. 30, 2017 | Apr. 29, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Amt of Gain (Loss) (net of tax) Recognized in OCI on Derivative (Effective Portion) and recorded in Accrued Expenses at Fair Value | $ 15 |  | $ (55)
Cash Flow Hedge [Member] | Foreign Currency Contract [Member] | EURO [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Amt of Gain (Loss) (net of tax) Recognized in OCI on Derivative (Effective Portion) and recorded in Accrued Expenses at Fair Value | 15 |  |
Other Expense [Member] | Cash Flow Hedge [Member] | Foreign Currency Contract [Member] | EURO [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) | (40) |  |
Amount of Gain (loss) (net of tax) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) | $ 0 | $ 0 |

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=109977999&loc=d3e76258-113986 + Details
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