PENSION AND POSTRETIREMENT BENEFITS (Components) (Details) - USD ($) $ in Millions	12 Months Ended
	May 29, 2016	May 31, 2015	May 25, 2014
Changes in benefit obligations and plan assets
Special termination benefits	$ 25.6
Pension Benefits
Changes in benefit obligations and plan assets
Service cost	93.8	$ 88.5	$ 89.0
Interest cost	159.8	161.3	151.1
Expected return on plan assets	(259.9)	(267.9)	(252.9)
Amortization of prior service cost (benefit)	2.7	3.7	3.8
Special termination benefits	25.6	6.9	0.4
Recognized net actuarial loss	348.5	6.9	2.7
Curtailment loss	0.3	1.5	0.0
Benefit cost — Company plans	370.8	0.9	(5.9)
Pension benefit cost — multi-employer plans	42.9	12.4	12.6
Total benefit cost	413.7	13.3	6.7
Other Benefits
Changes in benefit obligations and plan assets
Service cost	0.4	0.6	0.7
Interest cost	7.5	9.9	9.7
Expected return on plan assets	0.0	0.0	0.0
Amortization of prior service cost (benefit)	(7.8)	(7.9)	(7.2)
Special termination benefits	0.0	0.0	0.0
Recognized net actuarial loss	0.1	3.5	6.7
Curtailment loss	0.0	0.0	0.0
Benefit cost — Company plans	0.2	6.1	9.9
Pension benefit cost — multi-employer plans	0.0	0.0	0.0
Total benefit cost	$ 0.2	$ 6.1	$ 9.9