Pension Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Mar. 25, 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						Six Months Ended
	March 25,			March 26,			March 25,			March 26,
	2017			2016			2017			2016
Interest cost	$	1,041		$	1,260		$	2,082		$	2,521
Expected return on plan assets		(537	)		(854	)		(1,075	)		(1,709	)
Amortization of net loss (gain)		1,300			1,475			2,600			2,609
Net periodic benefit cost	$	1,804		$	1,881		$	3,607		$	3,421

	Postretirement Benefits
	Three Months Ended						Six Months Ended
	March 25,			March 26,			March 25,			March 26,
	2017			2016			2017			2016
Interest cost	$	96		$	130		$	193		$	260
Amortization of prior service credits		—			(100	)		—			(200	)
Amortization of net loss (gain)		(97	)		(74	)		(194	)		(149	)
Net periodic benefit cost	$	(1	)	$	(44	)	$	(1	)	$	(89	)