Debt (Schedule of credit facilities) (Details) $ in Billions	9 Months Ended
	Feb. 26, 2017 USD ($)
Line Of Credit Facility [Line Items]
Facility Amount	$ 3.4
Borrowed Amount	0.3
Committed Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Facility Amount	2.9
Borrowed Amount	$ 0.2
Minimum fixed charge coverage ratio	2.5
Compliance with credit facility covenants	As of quarter end, we were in compliance with all of these covenants.
Line of Credit Expiring May 2021 [Member]
Line Of Credit Facility [Line Items]
Facility Amount	$ 2.7
Borrowed Amount	$ 0.0
Expiration date of credit facility	May 31, 2021
Line of Credit Expiring June 2019 [Member]
Line Of Credit Facility [Line Items]
Facility Amount	$ 0.2
Borrowed Amount	$ 0.2
Expiration date of credit facility	Jun. 30, 2019
Line of Credit One Terminated in Fiscal 2016 [Member]
Line Of Credit Facility [Line Items]
Facility Amount	$ 1.7
Line of Credit Two Terminated in Fiscal 2016 [Member]
Line Of Credit Facility [Line Items]
Facility Amount	1.0
Uncommitted Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Facility Amount	0.5
Borrowed Amount	$ 0.1