Debt (Schedule of credit facilities) (Details) $ in Billions	3 Months Ended
	Aug. 28, 2016 USD ($)
Line Of Credit Facility [Line Items]
Facility Amount	$ 3.3
Borrowed Amount	0.2
Committed Credit Facilities [Member]
Line Of Credit Facility [Line Items]
Facility Amount	2.9
Borrowed Amount	$ 0.1
Minimum fixed charge coverage ratio	2.5
Compliance with credit facility covenants	As of February 28, 2016, 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	$ 0.1
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	0.4
Borrowed Amount	$ 0.1