Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Mar. 28, 2015		Mar. 29, 2014		Mar. 28, 2015		Mar. 29, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	$ (44,816)		$ (46,211)		$ (45,905)		$ (47,353)
Other comprehensive income before reclassifications	(500)		(90)		(727)		(256)
Reclassifications to earnings	1,303		1,301		2,619		2,609
Other comprehensive income	803		1,211		1,892		2,353
Balance ending	(44,013)		(45,000)		(44,013)		(45,000)
Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(1,410)		(2,241)		(1,540)		(2,428)
Other comprehensive income before reclassifications	(500)		(90)		(727)		(256)
Reclassifications to earnings	344	[1]	346	[1]	701	[1]	699	[1]
Other comprehensive income	(156)		256		(26)		443
Balance ending	(1,566)		(1,985)		(1,566)		(1,985)
Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(47,904)		(48,864)		(49,034)		(49,987)
Other comprehensive income	1,131		1,123		2,261		2,246
Balance ending	(46,773)		(47,741)		(46,773)		(47,741)
Amortization of Net Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications to earnings	1,131	[2]	1,123	[2]	2,261	[2]	2,246	[2]
Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	4,498		4,894		4,669		5,062
Other comprehensive income	(172)		(168)		(343)		(336)
Balance ending	4,326		4,726		4,326		4,726
Amortization of Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications to earnings	(123)	[2]	(122)	[2]	(245)	[2]	(245)	[2]
Amortization of Net (Gain) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications to earnings	$ (49)	[2]	$ (46)	[2]	$ (98)	[2]	$ (91)	[2]

[1] Reclassification of realized losses on cash flow hedges are recognized in interest expense.

[2] These amounts are included in the computation of net periodic benefit cost. See Note 12, "Pension Plan and Other Postretirement Benefits".