Pension, Postretirement, and Postemployement Obligations (Details) (USD $)	3 Months Ended						12 Months Ended
	Sep. 30, 2012	Jun. 26, 2011	Mar. 27, 2011	Dec. 26, 2010	Mar. 28, 2010	Dec. 27, 2009	Sep. 30, 2012	Sep. 25, 2011	Sep. 26, 2010
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailment gains		$ 3,974,000	$ 1,991,000	$ 10,172,000			$ 0	$ 16,137,000	$ 45,012,000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailment gains					2,004,000
Defined Benefit Plan, Effect of Plan Amendment and Curtailment on Net Periodic Benefit Cost		188,000			668,000
Defined Benefit Plan, Effect of Plan Amendment or Curtailment on the Accumulated Benefit Obligation		592,000			2,004,000
Defined Benefit Plan, Service Cost	(30,000)						30,000	169,000	792,000
Defined Benefit Plan, Interest Cost	7,975,000						(7,975,000)	8,354,000	8,888,000
Defined Benefit Plan, Expected Return on Plan Assets							8,891,000	9,733,000	9,568,000
Defined Benefit Plan, Amortization of Net Gains (Losses)	201,219,000						(2,370,000)	812,000	453,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)							136,000	137,000	136,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments							0	0	2,004,000
Defined Benefit Plan, Net Periodic Benefit Cost							1,348,000	(535,000)	(1,575,000)
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Curtailment gains		3,974,000	1,991,000	10,172,000	11,878,000	31,130,000
Defined Benefit Plan, Effect of Plan Amendment and Curtailment on Net Periodic Benefit Cost		82,000		769,000		1,460,000
Defined Benefit Plan, Effect of Plan Amendment or Curtailment on the Accumulated Benefit Obligation		3,371,000	3,030,000	15,065,000	6,576,000	28,750,000
Defined Benefit Plan, Service Cost	(728,000)						728,000	927,000	361,000
Defined Benefit Plan, Interest Cost	1,109,000						(1,109,000)	1,600,000	2,971,000
Defined Benefit Plan, Expected Return on Plan Assets							2,129,000	2,248,000	2,274,000
Defined Benefit Plan, Amortization of Net Gains (Losses)							2,451,000	(2,467,000)	(2,447,000)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)							1,459,000	1,455,000	1,994,000
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments							0	16,137,000	43,008,000
Defined Benefit Plan, Net Periodic Benefit Cost							$ (4,202,000)	$ (19,780,000)	$ (46,391,000)