Quarterly Data (Unaudited) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
May 27, 2018	May 27, 2018	May 28, 2017
QUARTERLY DATA (UNAUDITED) [Abstract]
Impairment charge	$ 96.9	$ 96.9	$ 0.0
Business Acquisition, Blue Buffalo [Member]
Business Acquisition [Line Items]
Acquisition integration costs	$ 64.5		$ 83.9

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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

Name:	us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration