EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Millions			3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2020 USD ($) union	Mar. 05, 2020 USD ($)	Sep. 12, 2020 USD ($)	Sep. 07, 2019 USD ($)	Sep. 12, 2020 USD ($)	Sep. 07, 2019 USD ($)	Feb. 29, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contribution made to defined benefit plan			$ 1.7	$ 1.8	$ 56.3	$ 7.0
Expected future employer contributions for remainder of the fiscal year			6.1		6.1
Defined contribution plan costs recognized			$ 16.3	$ 14.0	$ 38.1	$ 32.6
Number of local unions ratifying the agreement | union	9
Period of expected future employer contributions	3 years
Combined Plan
Defined Benefit Plan Disclosure [Line Items]
Required annual contribution		$ 23.2
Defined contribution plan term		25 years
MAP And FELRA
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan costs recognized							$ 26.2
Variable Annuity Pension Plan (VAPP)
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions	$ 286.0
Plan pre-funding Period	30 days
Expected future employer contributions, after-tax	$ 213.0
Minimum | Variable Annuity Pension Plan (VAPP)
Defined Benefit Plan Disclosure [Line Items]
Number of installments for expected future employer contribution | union	3
Pre-funded reserve amount	$ 8.0
Maximum | Variable Annuity Pension Plan (VAPP)
Defined Benefit Plan Disclosure [Line Items]
Number of installments for expected future employer contribution | union	4
Pre-funded reserve amount	$ 9.0