PENSION AND POSTRETIREMENT BENEFITS (Level 3) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 25, 2014	May 26, 2013
Change in the fair value of the Plan assets
Fair Value, Beginning Balance	$ 592.3	$ 528.1
Business Combination		5.8
Realized Gains (Losses)	3.8	(21.9)
Unrealized Gains (Losses)	42.5	71.9
Net, Purchases and Sales	92.2	8.4
Fair Value, Ending Balance	730.8	592.3
Real estate funds
Change in the fair value of the Plan assets
Fair Value, Beginning Balance	91.5	83.3
Realized Gains (Losses)	0.4	(23.9)
Unrealized Gains (Losses)	11.8	26.6
Net, Purchases and Sales	66.9	5.5
Fair Value, Ending Balance	170.6	91.5
Multi-strategy hedge funds
Change in the fair value of the Plan assets
Fair Value, Beginning Balance	413.9	379.1
Realized Gains (Losses)	0.2	0.4
Unrealized Gains (Losses)	21.2	36.6
Net, Purchases and Sales	27.0	(2.2)
Fair Value, Ending Balance	462.3	413.9
Private equity
Change in the fair value of the Plan assets
Fair Value, Beginning Balance	79.1	64.2
Business Combination		5.8
Realized Gains (Losses)	3.2	1.6
Unrealized Gains (Losses)	8.0	8.2
Net, Purchases and Sales	(9.0)	(0.7)
Fair Value, Ending Balance	81.3	79.1
Private Natural Resources
Change in the fair value of the Plan assets
Fair Value, Beginning Balance	7.8	1.5
Realized Gains (Losses)	0	0
Unrealized Gains (Losses)	1.5	0.5
Net, Purchases and Sales	7.3	5.8
Fair Value, Ending Balance	$ 16.6	$ 7.8