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

X

- References

No definition available.

+ Details

Name:	us-gaap_LIFOMethodRelatedItemsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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