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Accounting Policies - Inventories (Details) | Apr. 28, 2018 | Apr. 29, 2017
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Inventories |  |
Inventory cost determined using LIFO basis (as a percent) | 64.00% | 63.00%

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- References No definition available. + Details
Name: | us-gaap_LIFOMethodRelatedItemsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of LIFO (last in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
Name: | us-gaap_PercentageOfLIFOInventory
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant