Accounting Policies - Goodwill (Details) - Retail Segment	12 Months Ended
Apr. 28, 2018 region item
Goodwill
Number of geographic regions \| region	3
Number of reporting units for goodwill \| item	1

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.

No definition available.

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