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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Sep. 11, 2021
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
Pension and Other Post-Retirement Benefits

The following tables provide the components of net pension and post-retirement (income) expense (in millions):
12 weeks ended
PensionOther post-retirement benefits
September 11,
2021		September 12,
2020		September 11,
2021		September 12,
2020
Estimated return on plan assets$(24.5)$(23.7)$— $— 
Service cost5.1 3.5 — — 
Interest cost9.7 12.6 0.1 0.1 
Amortization of prior service cost— — — 0.4 
Amortization of net actuarial loss (gain)0.2 0.5 (0.1)(0.1)
Settlement (gain) loss(14.3)3.0 — — 
(Income) expense, net$(23.8)$(4.1)$— $0.4 

28 weeks ended
PensionOther post-retirement benefits
September 11,
2021		September 12,
2020		September 11,
2021		September 12,
2020
Estimated return on plan assets$(57.2)$(55.2)$— $— 
Service cost12.0 8.3 — — 
Interest cost22.7 29.2 0.2 0.2 
Amortization of prior service cost0.1 0.1 — 1.0 
Amortization of net actuarial loss (gain)0.5 1.1 (0.3)(0.3)
Settlement (gain) loss(14.3)3.0 — — 
(Income) expense, net$(36.2)$(13.5)$(0.1)$0.9 

The Company contributed $9.2 million and $11.2 million to its defined pension plans and post-retirement benefit plans during the 12 and 28 weeks ended September 11, 2021, respectively. For the 12 and 28 weeks ended September 12, 2020, the Company contributed $1.7 million and $56.3 million, respectively. At the Company's discretion, additional funds may be contributed to the defined benefit pension plans that are determined to be beneficial to the Company. The Company currently anticipates contributing an additional $26.1 million to these plans for the remainder of fiscal 2021.

During the 12 and 28 weeks ended September 11, 2021, the Company purchased a group annuity policy and transferred $203.5 million of pension plan assets to an insurance company, thereby reducing the Company's defined benefit pension obligations by $205.4 million. As a result of the annuity purchase, the Company recorded a settlement gain of $11.1 million during the 12 and 28 weeks ended September 11, 2021.
Defined Contribution Plans and Supplemental Retirement Plans

Total contributions expensed for defined contribution plans (401(k) plans) were $26.4 million and $16.3 million for the 12 weeks ended September 11, 2021 and September 12, 2020, respectively. For the 28 weeks ended September 11, 2021 and September 12, 2020, total contributions expensed were $42.6 million and $38.1 million, respectively.

Multiemployer Pension Plans

ARP Act: The American Rescue Plan Act ("ARP Act") was signed into law on March 11, 2021. The ARP Act establishes a special financial assistance program for financially troubled multiemployer pension plans. Under the ARP Act, eligible multiemployer plans can apply to receive a one-time cash payment in the amount projected by the Pension Benefit Guaranty Corporation ("PBGC") to pay pension benefits through the plan year ending 2051. On July 9, 2021, the PBGC issued its interim final rule with respect to the special financial assistance program. The PBGC interim final rule provides direction on the application requirements, identifies which plans will have priority, eligibility requirements, the determination of the amount of financial assistance to be provided and establishes conditions and restrictions that apply to plans that receive the assistance. The Company is evaluating the interim final rule and has submitted comments during the 30-day comment period. The Company's evaluation includes any potential impact to the Company's Excess Plan as defined in and further described in "Part II—Item 8. Financial Statements and Supplemental Data—Note 12" of the Company's Annual Report on Form 10-K for the fiscal year ended February 27, 2021.