	Pension Benefits
	Three Months Ended
	December 29,			December 30,
	2018			2017
Interest cost	$	986		$	944
Expected return on plan assets		(431	)		(474	)
Amortization of net loss		866			921
Net periodic benefit cost	$	1,421		$	1,391

	Postretirement Benefits
	Three Months Ended
	December 29,			December 30,
	2018			2017
Interest cost	$	69		$	69
Amortization of prior service credits		(124	)		(124	)
Amortization of net (gain)		(190	)		(164	)
Net periodic benefit cost	$	(245	)	$	(219	)

The Partnership expects to contribute approximately $4,800 to the defined benefit pension plan during fiscal 2019, of which $925 was contributed during the three months ended December 29, 2018. The projected annual contribution requirements related to the Partnership’s postretirement health care and life insurance benefit plan for fiscal 2019 is $1,129, of which $240 was contributed during the three months ended December 29, 2018. The components of net periodic benefit cost are included in the line item Other, net in the condensed consolidated statements of operations.

The Partnership contributes to multi-employer pension plans (“MEPPs”) in accordance with various collective bargaining agreements covering union employees. As one of the many participating employers in these MEPPs, the Partnership is responsible with the other participating employers for any plan underfunding. As of December 29, 2018 and September 29, 2018, the Partnership’s estimated obligation to these MEPPs was $22,245 and $22,509, respectively, as a result of its voluntary full withdrawal from certain MEPPs.