Postretirement 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. 29, 2013	Sep. 30, 2012	Sep. 25, 2011	Sep. 26, 2010
Defined Benefit Plan Disclosure [Line Items]
Curtailment gains		$ 3,974,000	$ 1,991,000	$ 10,172,000				$ 0	$ 16,137,000	$ 45,012,000
Postretirement assets, net	7,551,000							7,551,000	14,934,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [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, Expected Future Benefit Payments, Next Twelve Months	3,280,000							3,280,000
Prescription Drug Subsidy Receipts, Next Twelve Months	(220,000)							(220,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Next Twelve Months	3,060,000							3,060,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components								53,000
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year								9.00%	9.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate							4.00%		5.00%	6.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%							4.00%	4.00%
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax								16,570,000	27,000
Postretirement assets, net	7,551,000							7,551,000	15,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	4,016,000							4,016,000	3,000
Defined Benefit Plan, Benefit Obligation	30,728,000							30,728,000	26,472,000	50,482,000
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)
Defined Benefit Plan, Actuarial Gain (Loss)								5,269,000	(2,311,000)
Defined Benefit Plan, Benefits Paid								(2,965,000)	(2,922,000)
Defined Benefit Plan, Benefits Paid For Non-Participants								(2,852,000)	(1,524,000)
Defined Benefit Plan, Plan Amendments								0	(5,931,000)
Defined Benefit Plan, Curtailments								0	(15,535,000)
Prescription Drug Benefit, Effect of Subsidy on Net Periodic Postretirement Benefit Cost								115,000	162,000
Defined Benefit Plan, Fair Value of Plan Assets	34,263,000							34,263,000	38,529,000	41,447,000
Defined Benefit Plan, Actual Return on Plan Assets								2,127,000	19,000
Defined Benefit Plan, Contributions by Employer								(690,000)	1,347,000
Defined Benefit Plan, Benefits Paid Net Of Subsidy								(2,851,000)	(2,760,000)
Defined Benefit Plan, Funded Status of Plan	(3,535,000)							(3,535,000)	(12,057,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	30,344,000							30,344,000	42,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax								13,774,000	15,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax								30,344,000	42,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long-term Return on Assets	4.50%							4.50%	5.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets							6.00%		6.00%	6.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate								5.00%	5.00%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2020							2020	2019
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components								(48,000)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation								1,452,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation								(1,306,000)
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	3,080,000							3,080,000
Prescription Drug Subsidy Receipts, Year Two	(230,000)							(230,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 2	2,850,000							2,850,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	2,980,000							2,980,000
Prescription Drug Subsidy Receipts, Year Three	(230,000)							(230,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 3	2,750,000							2,750,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	2,960,000							2,960,000
Prescription Drug Subsidy Receipts, Year Four	(230,000)							(230,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 4	2,730,000							2,730,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	2,900,000							2,900,000
Prescription Drug Subsidy Receipts, Year Five	(230,000)							(230,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 5	2,670,000							2,670,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	13,280,000							13,280,000
Prescription Drug Subsidy Receipts, after Year Five	(1,100,000)							(1,100,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, After Year 5	12,180,000							12,180,000
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, Litigation Settlement								3,000,000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	21.00%							21.00%	8.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum								10.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum								30.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	75.00%							75.00%	85.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum								70.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum								90.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	25,642,660.000							25,642,660.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	2.00%							2.00%	7.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	691,905.000							691,905.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	2.00%							2.00%	0.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	802,801.000							802,801.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [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, Expected Future Benefit Payments, Next Twelve Months	11,000							11,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate								4.00%	5.00%	6.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%							4.00%	4.00%
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax							2,287,000	(51,871,000)	(51,459,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent	66,319,000							66,319,000	71,230,000
Defined Benefit Plan, Benefit Obligation	201,219,000							201,219,000	186,826,000	178,179,000
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)
Defined Benefit Plan, Actuarial Gain (Loss)								17,268,000	12,299,000
Defined Benefit Plan, Benefits Paid								(10,880,000)	(11,584,000)
Defined Benefit Plan, Curtailments								0	(591,000)
Defined Benefit Plan, Fair Value of Plan Assets	134,900,000							134,900,000	115,596,000	125,464,000
Defined Benefit Plan, Actual Return on Plan Assets								24,849,000	1,007,000
Defined Benefit Plan, Contributions by Employer							2,733,000	6,807,000	2,137,000
Defined Benefit Plan, Funded Status of Plan	66,319,000							66,319,000	71,230,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax	(50,945,000)							(50,945,000)	(50,396,000)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax							(137,000)	926,000	1,063,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax								(50,945,000)	(50,396,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets							0.00%	8.00%	8.00%	8.00%
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	11,000							11,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	11,000							11,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	11,000							11,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	11,000							11,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	58,000							58,000
Defined Benefit Plan, Effect of Plan Amendment or Curtailment on the Accumulated Benefit Obligation		592,000			2,004,000
Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	63.00%							63.00%	66.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum								50.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum								75.00%
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	29.00%							29.00%	33.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum								25.00%
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum								35.00%
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	32,169,494.000							32,169,494.000
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	7,759,444.000							7,759,444.000
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Pension Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	2.00%							2.00%	1.00%
Pension Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2,028,505.000							2,028,505.000
Pension Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Pension Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Pension Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	6.00%							6.00%	0.00%
Pension Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8,117,459.000							8,117,459.000
Pension Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Pension Plans, Defined Benefit [Member] | Plan Assets- Receivables, net [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
LTD Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status of Plan	3,143,000							3,143,000	3,227,000
Domestic Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4,384,746.000							4,384,746.000
Domestic Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2,068,890.000							2,068,890.000
Domestic Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
Domestic Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	27,499,395.000							27,499,395.000
Domestic Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	47,713,917.000							47,713,917.000
Domestic Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
International Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
International Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	671,069.000							671,069.000
International Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
International Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0.000							0.000
International Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	9,612,986.000							9,612,986.000
International Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 0.000							$ 0.000