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:
Cash used for operating activities	$ 21.0
Cash paid for amounts included in the measurement of lease liabilities:
Cash used for financing activities	1.8
Noncash investing and financing activities:
Asset obtained in exchange for new operating lease obligations	36.5
Assets obtained in exchange for new finance lease obligations	$ 2.1