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Contingencies and Commitments (Details) - Civil lawsuit - Court ruling under appeal - USD ($) $ in Millions | 12 Months Ended
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Apr. 29, 2017 | Apr. 30, 2016
Contingencies and Commitments |  |
Litigation expense recognized |  | $ 5.5
Interest expense recognized | $ 0.5 |

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- Definition Interest expense (income) directly attributable to an award in settlement of litigation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |