NET INCOME PER COMMON SHARE - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended							4 Months Ended		9 Months Ended	12 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Sep. 07, 2019	Feb. 23, 2019	Dec. 01, 2018	Sep. 08, 2018	Feb. 24, 2018	Jun. 15, 2019	Jun. 16, 2018	Dec. 02, 2017	Feb. 29, 2020	Feb. 23, 2019	Feb. 24, 2018
Earnings Per Share [Abstract]
Net loss	$ 67.8	$ 54.8	$ 294.8	$ 135.6	$ 45.6	$ (32.4)	$ 388.3	$ 49.0	$ (17.7)	$ (342.0)	$ 466.4	$ 131.1	$ 46.3
Weighted average common shares outstanding (in shares)											279,600,000	280,100,000	279,700,000
Dilutive effect of potential common shares (in shares)											500,000	100,000	0
Weighted average common shares and potential dilutive common shares outstanding (in share)											280,100,000	280,200,000	279,700,000
Basic net income per common shares (in dollars per share)											$ 1.67	$ 0.47	$ 0.17
Diluted net income per common shares (in dollars per share)											$ 1.67	$ 0.47	$ 0.17
Common shares remaining to be issued (in shares)											600,000	900,000	0
Number of securities excluded from computation of earnings per share (in shares)											0	0	1,300,000