PENSION AND POSTRETIREMENT BENEFITS - Schedule of Contributions for Plans That Are Not Individually Significant (Details) - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Multiemployer Plans [Line Items]
Total Contributions	$ 8.0	$ 11.1	$ 12.0
Bakery and Confectionary Union and Industry International Pension Plan
Multiemployer Plans [Line Items]
Total Contributions	1.8	3.1	3.7
Central States, Southeast and Southwest Areas Pension Fund
Multiemployer Plans [Line Items]
Total Contributions	1.8	1.9	2.0
National Conference of Fireman & Oilers National Pension Fund
Multiemployer Plans [Line Items]
Total Contributions	0.0	0.0	0.6
Western Conference of Teamsters Pension Plan
Multiemployer Plans [Line Items]
Total Contributions	4.0	5.4	4.9
Other Plans
Multiemployer Plans [Line Items]
Total Contributions	$ 0.4	$ 0.7	$ 0.8