Leases (Supplemental Cash Flow Information) (Details) $ in Millions	9 Months Ended
	Feb. 23, 2020 USD ($)
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 277.1
Operating cash flows from finance leases	11.5
Financing cash flows from finance leases	3.8
Right-of-use assets obtained in exchange for lease liabilities
Right-of-use assets obtained in exchange for new operating lease liabilities	164.5
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 166.2
Weighted-Average Remaining Lease Term (Years)
Operating leases (years)	17 years 1 month 6 days
Finance leases (years)	20 years 3 months 18 days
Weighted-Average Discount Rate
Operating leases (percent)	4.20%
Finance leases (percent)	4.80%