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Fair Value Measurement -Narrative (Details) - USD ($) | 12 Months Ended
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Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Impairment of intangible assets | $ 0 | $ 830,000 | $ 0
Recurring Basis |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets (Liability), net | 63,082,000 | 63,448,000 |
Estimate of Fair Value Measurement | Recurring Basis | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Assets (Liability), net | (1,000,000) | $ (1,891,000) |
Sensitivity analysis of fair value, fair value, net asset (liability), impact of change in assumption | $ 0 |  |

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- Definition Sensitivity Analysis of Fair Value, Fair Value, Net Asset (Liability), Impact of Change in Assumption + References No definition available. + Details
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- 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. + Details
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- Definition Fair value of asset after deduction of liability. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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