Stock Plans (Schedule of Windfall tax benefits from stock-based payments in income tax expense) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Feb. 28, 2021	Feb. 23, 2020	Feb. 28, 2021	Feb. 23, 2020
Stock Plans [Abstract]
Windfall tax benefits from stock-based payments	$ 1.6	$ 4.1	$ 8.4	$ 12.3

Amount of tax benefit from exercise of option under share-based payment arrangement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=SL79508275-113901

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration