BUSINESS SEGMENTS AND RELATED INFORMATION - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 25, 2018 USD ($)	Feb. 26, 2017 USD ($)	Feb. 25, 2018 USD ($) segment	Feb. 26, 2017 USD ($)	May 28, 2017 USD ($)
Revenue, Major Customer [Line Items]
Number of reportable segments | segment			5
Cumulative net derivative losses from economic hedges recognized in general corporate expenses	$ (1.1)		$ (1.1)
Net losses incurred			0.6
Net losses incurred in prior fiscal years					$ 0.5
Losses expected to be reclassified			0.6
Losses expected to be reclassified in fiscal 2019 and thereafter			0.5
Total depreciation expense	55.5	$ 57.5	167.2	$ 174.5
Accounts payable to suppliers who utilize third-party service	$ 80.6		$ 80.6
Customer concentration risk | Wal-Mart Stores, Inc. and affiliates | Net sales
Revenue, Major Customer [Line Items]
Concentration risk (as a percent)	24.00%	24.00%	24.00%	24.00%
Customer concentration risk | Wal-Mart Stores, Inc. and affiliates | Net receivables
Revenue, Major Customer [Line Items]
Concentration risk (as a percent)			24.00%		26.00%