EMPLOYEE BENEFIT PLANS AND COLLECTIVE BARGAINING AGREEMENTS - Schedule of Components of Net Pension and Post-retirement Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 24, 2024	Feb. 25, 2023	Feb. 26, 2022
Components of net (income) expense:
Loss (income) due to settlement accounting			$ (11.1)
Pension
Components of net (income) expense:
Estimated return on plan assets	$ (98.5)	$ (92.9)	(101.1)
Service cost	17.3	19.9	21.8
Interest cost	83.6	51.4	39.9
Amortization of prior service cost	0.4	0.3	0.3
Amortization of net actuarial (gain) loss	(5.5)	0.2	0.8
Loss (income) due to settlement accounting	0.3	(0.6)	(16.2)
(Income) expense, net	(2.4)	(21.7)	(54.5)
Changes in plan assets and benefit obligations recognized in Other comprehensive income (loss):
Net actuarial (gain) loss	(28.0)	(1.1)	(23.2)
Amortization of net actuarial gain (loss)	5.5	(0.2)	(0.8)
Prior service cost	(0.2)	0.5	0.7
Amortization of prior service cost	(0.4)	(0.3)	(0.3)
(Loss) income due to settlement accounting	(0.3)	0.6	16.2
Total recognized in Other comprehensive income (loss)	(23.4)	(0.5)	(7.4)
Total net expense and changes in plan assets and benefit obligations recognized in Other comprehensive income (loss)	(25.8)	(22.2)	(61.9)
Other Post-Retirement Benefits
Components of net (income) expense:
Estimated return on plan assets	0.0	0.0	0.0
Service cost	0.0	0.0	0.0
Interest cost	0.6	0.4	0.2
Amortization of prior service cost	0.0	0.0	0.0
Amortization of net actuarial (gain) loss	(1.1)	(0.4)	(0.4)
Loss (income) due to settlement accounting	0.0	0.0	0.0
(Income) expense, net	(0.5)	0.0	(0.2)
Changes in plan assets and benefit obligations recognized in Other comprehensive income (loss):
Net actuarial (gain) loss	0.8	(5.4)	(0.4)
Amortization of net actuarial gain (loss)	1.1	0.4	0.4
Prior service cost	0.0	0.0	0.0
Amortization of prior service cost	0.0	0.0	0.0
(Loss) income due to settlement accounting	0.0	0.0	0.0
Total recognized in Other comprehensive income (loss)	1.9	(5.0)	0.0
Total net expense and changes in plan assets and benefit obligations recognized in Other comprehensive income (loss)	$ 1.4	$ (5.0)	$ (0.2)