PENSION AND POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 25, 2014	May. 26, 2013
Change in Plan Assets
Fair value of plan assets at beginning of year	$ 3,546.0
Investment and administrative expenses	(3,472.1)	$ (2,771.2)	$ (2,065.9)
Fair value of plan assets at end of year	3,539.0	3,546.0
Pension Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	3,979.0	3,817.5
Service cost	88.5	89.0	81.8
Interest cost	161.3	151.1	150.1
Plan participants’ contributions	0.0	0.0
Amendments	0.7	2.2
Actuarial loss (gain)	35.7	79.5
Special termination benefits	6.9	0.4
Benefits paid	(176.7)	(159.5)
Currency	(3.2)	(1.2)
Benefit obligation at end of year	4,092.2	3,979.0	3,817.5
Change in Plan Assets
Fair value of plan assets at beginning of year	3,546.0	3,343.3
Actual return on plan assets	178.6	358.8
Employer contributions	13.5	18.3
Plan participants’ contributions	0.0	0.0
Investment and administrative expenses	(18.8)	(13.8)
Benefits paid	(176.7)	(159.5)
Currency	(3.6)	(1.1)
Fair value of plan assets at end of year	3,539.0	3,546.0	3,343.3
Other Benefits
Change in Benefit Obligation
Benefit obligation at beginning of year	283.5	302.8
Service cost	0.6	0.7	0.6
Interest cost	9.9	9.7	10.5
Plan participants’ contributions	5.9	6.1
Amendments	(3.3)	(5.7)
Actuarial loss (gain)	(35.9)	(4.6)
Special termination benefits	0.0	0.0
Benefits paid	(24.3)	(25.1)
Currency	(1.0)	(0.4)
Benefit obligation at end of year	235.4	283.5	302.8
Change in Plan Assets
Fair value of plan assets at beginning of year	0.3	0.1
Actual return on plan assets	(0.3)	0.2
Employer contributions	18.5	19.0
Plan participants’ contributions	5.9	6.1
Investment and administrative expenses	0.0	0.0
Benefits paid	(24.3)	(25.1)
Currency	0.0	0.0
Fair value of plan assets at end of year	$ 0.1	$ 0.3	$ 0.1