DESCRIPTION OF BUSINESS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 23, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of LIFO inventory	84.90%	85.60%
Inventory, LIFO reserve	$ 202.2	$ 143.5
Decrease in cost of sales	$ 11.8	$ 12.9	$ 18.1