EMPLOYEE BENEFIT PLANS AND OTHER POST-RETIREMENT BENEFITS - Condensed Combined and Consolidated Balance Sheets (Details) - USD ($) $ in Millions	May 31, 2020	May 26, 2019
Pension Plans
Amounts Recognized on Consolidated Balance Sheets
Other noncurrent liabilities	$ (10.1)	$ (10.3)
Accrued obligation recognized	(10.1)	(10.3)
Amounts Recognized in Accumulated Other Comprehensive Income Loss (Pre-tax)
Actuarial loss	4.4	4.0
Total	4.4	4.0
Post-Retirement Plan
Amounts Recognized on Consolidated Balance Sheets
Accrued liabilities	(0.2)	(0.3)
Other noncurrent liabilities	(6.3)	(7.0)
Accrued obligation recognized	(6.5)	(7.3)
Amounts Recognized in Accumulated Other Comprehensive Income Loss (Pre-tax)
Actuarial loss	1.1	2.7
Total	$ 1.1	$ 2.7