Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 27, 2014		Dec. 28, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	$ (45,905)		$ (47,353)
Other comprehensive income before reclassifications	(227)		(166)
Amounts reclassified from accumulated other comprehensive income	1,316		1,308
Other comprehensive income	1,089		1,142
Balance ending	(44,816)		(46,211)
Gains and Losses on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(1,540)		(2,428)
Other comprehensive income before reclassifications	(227)		(166)
Amounts reclassified from accumulated other comprehensive income	357	[1]	353	[1]
Other comprehensive income	130		187
Balance ending	(1,410)		(2,241)
Pension Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	(49,034)		(49,987)
Other comprehensive income before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	1,130	[2]	1,123	[2]
Other comprehensive income	1,130		1,123
Balance ending	(47,904)		(48,864)
Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance beginning	4,669		5,062
Other comprehensive income before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	(171)	[2]	(168)	[2]
Other comprehensive income	(171)		(168)
Balance ending	$ 4,498		$ 4,894

[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".