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Employee Benefit Plans
 6 Months Ended
Sep. 08, 2018
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 expense (in millions):
 
12 weeks ended
 
Pension
 
Other post-retirement benefits
 
September 8,
2018
 
September 9,
2017
 
September 8,
2018
 
September 9,
2017
Estimated return on plan assets
$
(26.0
)
 
$
(27.6
)
 
$
—

 
$
—

Service cost
12.1

 
11.5

 
0.2

 
0.2

Interest cost
19.8

 
20.4

 
0.1

 
0.2

Amortization of prior service cost
—

 
—

 
0.9

 
0.9

Amortization of net actuarial (gain) loss
(1.5
)
 
0.1

 
—

 
—

Net expense
$
4.4

 
$
4.4

 
$
1.2

 
$
1.3

 
28 weeks ended
 
Pension
 
Other post-retirement benefits
 
September 8,
2018
 
September 9,
2017
 
September 8,
2018
 
September 9,
2017
Estimated return on plan assets
$
(60.6
)
 
$
(64.4
)
 
$
—

 
$
—

Service cost
28.2

 
26.8

 
0.5

 
0.5

Interest cost
46.2

 
47.5

 
0.3

 
0.5

Amortization of prior service cost
—

 
0.1

 
2.0

 
2.0

Amortization of net actuarial (gain) loss
(3.4
)
 
0.2

 
(0.1
)
 
—

Net expense
$
10.4

 
$
10.2

 
$
2.7

 
$
3.0



The Company contributed $5.0 million and $10.5 million to its defined benefit pension plans and post-retirement benefit plans during the 12 and 28 weeks ended September 8, 2018, respectively. For the 12 and 28 weeks ended September 9, 2017, the Company contributed $4.3 million and $6.4 million to its defined benefit pension plans and post-retirement benefit plans, respectively. The Company's funding policy for the defined benefit pension plans is to contribute the minimum contribution required under the Employee Retirement Income Security Act of 1974, as amended, and other applicable laws as determined by the Company's external actuarial consultant. At the Company's discretion, additional funds may be contributed to the defined benefit pension plans. On September 14, 2018, subsequent to the end of the second quarter, the Company contributed $184.3 million to its defined benefit pension plans, which included $150.0 million of additional discretionary contributions to reduce the Pension Benefit Guaranty Corporation premium costs and improve the overall funded status of the plan. The Company currently anticipates contributing an additional $4.6 million to these plans for the remainder of fiscal 2018.

The Company also contributes to various multiemployer pension plans based on obligations arising from most of its collective bargaining agreements. These plans provide retirement benefits to participants based on their service to contributing employers. The Company recognizes expense in connection with these plans as contributions are funded.
Defined Contribution Plans and Supplemental Retirement Plans

Many of the Company's employees are eligible to contribute a percentage of their compensation to defined contribution plans ("401(k) Plans"). Participants in the 401(k) Plans may become eligible to receive a profit-sharing allocation in
the form of a discretionary Company contribution based on employee compensation. In addition, the Company may also provide matching contributions based on the amount of eligible compensation contributed by the employee. All Company contributions to the 401(k) Plans are made at the discretion of the Company's Board of Directors. Total contributions expensed for these plans were $6.5 million and $9.6 million for the 12 weeks ended September 8, 2018 and September 9, 2017, respectively. For the 28 weeks ended September 8, 2018 and September 9, 2017, total contributions expensed were $20.5 million and $23.2 million, respectively.