EMPLOYEE BENEFIT PLANS AND OTHER POST-RETIREMENT BENEFITS - Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	$ (1.6)	$ (7.2)	$ (3.9)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	1.0
Net amount recognized	1.0
Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Net actuarial gain (loss)	0.8
Amortization of prior service cost (benefit)	(0.2)
Net amount recognized	$ 0.6