PENSION AND POSTRETIREMENT BENEFITS - Components of Pension Benefit and Other Postretirement Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 15.9	$ 23.8	$ 32.6	$ 47.6
Interest cost	29.9	41.0	59.9	82.0
Expected return on plan assets	(53.9)	(66.8)	(107.7)	(133.7)
Amortization of prior service cost	0.7	0.7	1.3	1.4
Special termination benefits	1.5	0.0	1.5	0.0
Benefit cost — Company plans	(5.9)	(1.3)	(12.4)	(2.7)
Pension benefit cost — multi-employer plans	2.8	4.1	5.1	6.4
Total benefit cost (benefit)	(3.1)	2.8	(7.3)	3.7
Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.1	0.1	0.1	0.2
Interest cost	1.0	1.9	2.1	3.9
Amortization of prior service cost	(1.6)	(2.0)	(3.3)	(4.0)
Recognized net actuarial loss	0.1	0.0	0.2	0.0
Total benefit cost (benefit)	$ (0.4)	$ 0.0	$ (0.9)	$ 0.1