Pension Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Dec. 30, 2017

Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of Net Periodic Benefit Costs

The following table provides the components of net periodic benefit costs:

	Pension Benefits
	Three Months Ended
	December 30,			December 24,
	2017			2016
Interest cost	$	944		$	1,041
Expected return on plan assets		(474	)		(537	)
Amortization of net loss		921			1,300
Net periodic benefit cost	$	1,391		$	1,804

	Postretirement Benefits
	Three Months Ended
	December 30,			December 24,
	2017			2016
Interest cost	$	69		$	96
Amortization of prior service credits		(124	)		—
Amortization of net (gain)		(164	)		(97	)
Net periodic benefit cost	$	(219	)	$	(1	)