PENSION AND POSTRETIREMENT BENEFITS - Schedule of Contributions for Plans That Are Not Individually Significant (Details) - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Multiemployer Plans [Line Items]
Total Contributions	$ 6.5	$ 8.0	$ 11.1
Bakery and Confectionary Union and Industry International Pension Plan
Multiemployer Plans [Line Items]
Total Contributions	1.5	1.8	3.1
Central States, Southeast and Southwest Areas Pension Fund
Multiemployer Plans [Line Items]
Total Contributions	1.8	1.8	1.9
Western Conference of Teamsters Pension Plan
Multiemployer Plans [Line Items]
Total Contributions	2.8	4.0	5.4
Other Plans
Multiemployer Plans [Line Items]
Total Contributions	$ 0.4	$ 0.4	$ 0.7