RESTRUCTURING (Liabilities for Initiatives and Changes) (Details) (SCAE Plan [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Feb. 23, 2014
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 28.4
Costs incurred and charged to expense	28.0
Costs paid or otherwise settled	(20.2)
Ending balance	36.2
Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	17.2
Costs incurred and charged to expense	24.8
Costs paid or otherwise settled	(19.1)
Ending balance	22.9
Multi-employer Pension Cost [Member]
Restructuring Cost and Reserve [Line Items]
Beginning balance	11.2
Costs incurred and charged to expense	3.2
Costs paid or otherwise settled	(1.1)
Ending balance	$ 13.3