PENSION AND POSTRETIREMENT BENEFITS (Benefit Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	May 29, 2016	May 31, 2015	May 25, 2014
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	$ (390.5)	$ (143.8)
Amendments	(2.0)	(0.6)
Amortization of prior service cost (benefit)	2.7	5.2
Recognized net actuarial loss	348.5	6.9	$ 2.7
Net amount recognized	(41.3)	(132.3)
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial gain (loss)	(8.0)	35.8
Amendments	(5.6)	3.3
Amortization of prior service cost (benefit)	(7.8)	(7.9)
Recognized net actuarial loss	0.1	3.5	$ 6.7
Net amount recognized	$ (21.3)	$ 34.7