LEASES - Supplemental Cash Flow Information (Details) $ in Millions	3 Months Ended
	Aug. 25, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Cash used for operating activities	$ 3.1
Cash paid for amounts included in the measurement of lease liabilities:
Cash used for financing activities	0.4
Noncash investing and financing activities:
Asset obtained in exchange for new operating lease obligations	11.0
Assets obtained in exchange for new finance lease obligations	$ 0.8