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EMPLOYEE BENEFIT PLANS
 4 Months Ended
Jun. 15, 2019
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):
 
16 weeks ended
 
Pension
 
Other post-retirement benefits
 
June 15,
2019
 
June 16,
2018
 
June 15,
2019
 
June 16,
2018
Estimated return on plan assets
$
(33.9
)
 
$
(34.6
)
 
$
—

 
$
—

Service cost
4.5

 
16.1

 
0.2

 
0.3

Interest cost
24.8

 
26.4

 
0.2

 
0.2

Amortization of prior service cost
0.1

 
—

 
1.1

 
1.1

Amortization of net actuarial loss (gain)
0.2

 
(1.9
)
 
(0.1
)
 
(0.1
)
Net (income) expense
$
(4.3
)
 
$
6.0

 
$
1.4

 
$
1.5

 

The Company contributed $5.2 million and $5.5 million to its defined benefit pension plans and post-retirement benefit plans during the 16 weeks ended June 15, 2019 and June 16, 2018, respectively. At the Company's discretion, additional
funds may be contributed to the defined benefit pension plans. The Company currently anticipates contributing an additional $7.2 million to these plans for the remainder of fiscal 2019.
Defined Contribution Plans and Supplemental Retirement Plans

Total contributions expensed for defined contribution plans (401(k) plans) were $18.6 million and $14.0 million for the 16 weeks ended June 15, 2019 and June 16, 2018, respectively.