Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details) - USD ($) $ in Millions	May 28, 2017	May 29, 2016	May 31, 2015	May 25, 2014
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 233.1	$ 274.8	$ 535.9	$ 98.3
Short-term investments
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	102.8	166.7
Credit card receivables
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	93.6	81.1
Depository accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 36.7	$ 27.0