PENSION AND POSTRETIREMENT BENEFITS (Fair Value Hierarchy) (Details) (USD $) In Millions, unless otherwise specified	May 25, 2014	May 26, 2013
Fair value of Plan assets
Total Assets	$ 3,546.0	$ 3,343.3
Level 1
Fair value of Plan assets
Total Assets	1,626.9	1,682.1
Level 2
Fair value of Plan assets
Total Assets	1,188.3	1,068.9
Level 3
Fair value of Plan assets
Total Assets	730.8	592.3
Cash and cash equivalents
Fair value of Plan assets
Total Assets	152.6	195.8
Cash and cash equivalents | Level 1
Fair value of Plan assets
Total Assets	2.4	1.0
Cash and cash equivalents | Level 2
Fair value of Plan assets
Total Assets	150.2	194.8
U.S. equity securities
Fair value of Plan assets
Total Assets	628.6	856.9
U.S. equity securities | Level 1
Fair value of Plan assets
Total Assets	535.4	766.9
U.S. equity securities | Level 2
Fair value of Plan assets
Total Assets	93.2	90.0
International equity securities
Fair value of Plan assets
Total Assets	822.0	726.7
International equity securities | Level 1
Fair value of Plan assets
Total Assets	589.7	513.3
International equity securities | Level 2
Fair value of Plan assets
Total Assets	232.3	213.4
Government bonds
Fair value of Plan assets
Total Assets	380.3	289.5
Government bonds | Level 1
Fair value of Plan assets
Total Assets	114.0	108.7
Government bonds | Level 2
Fair value of Plan assets
Total Assets	266.3	180.8
Corporate bonds
Fair value of Plan assets
Total Assets	408.4	328.4
Corporate bonds | Level 1
Fair value of Plan assets
Total Assets	63.8	35.3
Corporate bonds | Level 2
Fair value of Plan assets
Total Assets	344.6	293.1
Mortgage-backed bonds
Fair value of Plan assets
Total Assets	127.9	140.2
Mortgage-backed bonds | Level 1
Fair value of Plan assets
Total Assets	50.2	57.1
Mortgage-backed bonds | Level 2
Fair value of Plan assets
Total Assets	77.7	83.1
Real estate funds
Fair value of Plan assets
Total Assets	197.4	114.1
Real estate funds | Level 1
Fair value of Plan assets
Total Assets	2.8	8.9
Real estate funds | Level 2
Fair value of Plan assets
Total Assets	24.0	13.7
Real estate funds | Level 3
Fair value of Plan assets
Total Assets	170.6	91.5
Multi-strategy hedge funds
Fair value of Plan assets
Total Assets	462.3	413.9
Multi-strategy hedge funds | Level 3
Fair value of Plan assets
Total Assets	462.3	413.9
Private equity
Fair value of Plan assets
Total Assets	81.3	79.1
Private equity | Level 3
Fair value of Plan assets
Total Assets	81.3	79.1
Master limited partnerships
Fair value of Plan assets
Total Assets	263.3	180.6
Master limited partnerships | Level 1
Fair value of Plan assets
Total Assets	263.3	180.6
Private Natural Resources
Fair value of Plan assets
Total Assets	16.6	7.8
Private Natural Resources | Level 3
Fair value of Plan assets
Total Assets	16.6	7.8
Net receivables for unsettled transactions
Fair value of Plan assets
Total Assets	5.3	10.3
Net receivables for unsettled transactions | Level 1
Fair value of Plan assets
Total Assets	$ 5.3	$ 10.3