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Pensions (Details) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 24, 2017	Sep. 25, 2016	Sep. 27, 2015
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		$ 13,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		4.00%	4.00%	4.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.00%	4.00%
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax	$ 2,025,000	$ (43,550,000)	$ (55,241,000)
Liability, Defined Benefit Plan, Noncurrent		(41,883,000)	(53,027,000)
Defined Benefit Plan, Benefit Obligation		191,645,000	202,158,000	$ 193,751,000
Defined Benefit Plan, Accumulated Benefit Obligation			202,158,000
Defined Benefit Plan, Service Cost		84,000	197,000	232,000
Defined Benefit Plan, Interest Cost		5,394,000	6,061,000	8,122,000
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		(4,241,000)	13,630,000
Defined Benefit Plan, Plan Assets, Administration Expense		(2,340,000)	(2,099,000)
Defined Benefit Plan, Plan Assets, Contributions by Employer	4,940,000	0	4,604,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets		(7,878,000)	(8,698,000)	(9,863,000)
Defined Benefit Plan, Amortization of Net Loss		(2,947,000)	2,397,000	1,682,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)		(136,000)	(136,000)	(136,000)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		411,000	(179,000)	37,000
Defined Benefit Plan, Fair Value of Plan Assets		149,762,000	149,131,000	$ 143,288,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		14,721,000	14,819,000
Defined Benefit Plan, Plan Assets, Benefits Paid		11,750,000	11,481,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(41,883,000)	(53,027,000)
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		(43,307,000)	(54,862,000)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax	$ (137,000)	243,000	379,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		$ (43,307,000)	$ (54,862,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		6.00%	6.00%	7.00%
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		$ 12,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		12,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		12,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		12,000
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter		$ 58,000
Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		50.00%	50.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		5000.00%
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		$ 14,710,824	$ 14,558,000
Defined Benefit Plan, Actual Plan Asset Allocations		33.00%	33.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		3500.00%
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		$ 26,014,990	$ 25,612,000
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		8,265,865	9,648,000
Pension Plans, Defined Benefit [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		4.00%	4.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		500.00%
Pension Plans, Defined Benefit [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 6,553,123	$ 6,883,000
Pension Plans, Defined Benefit [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0	0
Pension Plans, Defined Benefit [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		$ 19,066,897	$ 17,531,000
Defined Benefit Plan, Actual Plan Asset Allocations		12.00%	11.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		1000.00%
Pension Plans, Defined Benefit [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 0	$ 0
Pension Plans, Defined Benefit [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0	0
Pension Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		1.00%	2.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
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		$ 1,882,027	$ 2,757,000
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	0
Other Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded (Unfunded) Status of Plan		1,766,000	$ 2,232,000
Funded Status of Other Plans Recognized In Other Liabilities		113,000
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		$ 3,474,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		3.00%	4.00%	4.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		3.00%	3.00%
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax		$ 12,304,000	$ 11,089,000
Liability, Defined Benefit Plan, Noncurrent		(2,061,000)	(7,527,000)
Defined Benefit Plan, Benefit Obligation		15,667,000	22,511,000	$ 23,812,000
Defined Benefit Plan, Service Cost		13,000	63,000	0
Defined Benefit Plan, Interest Cost		412,000	623,000	1,000
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		(627,000)	(773,000)
Defined Benefit Plan, Plan Assets, Contributions by Employer		755,000	563,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets		(1,056,000)	(1,322,000)	(1,000)
Defined Benefit Plan, Amortization of Net Loss		987,000	(1,093,000)	(1,386)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)		(1,459,000)	(1,459,000)	(1,459)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		(6,818,000)	(3,188,000)	(3,000)
Defined Benefit Plan, Fair Value of Plan Assets		24,626,000	24,123,000	$ 30,123,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		2,112,000	1,085,000
Defined Benefit Plan, Plan Assets, Benefits Paid		1,527,000	1,434,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan		8,959,000	1,612,000
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		18,782,000	19,026,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax		6,478,000	7,937,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		$ 18,782,000	$ 19,026,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		5.00%	5.00%	5.00%
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		$ 1,393,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		1,372,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		1,340,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		1,298,000
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter		$ 5,582,000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations		0.00%	0.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		2000.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		100.00%	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		7000.00%
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		$ 19,547,636	$ 18,840,000
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		0	0
Other Postretirement Benefit Plans, Defined Benefit [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		$ 3,342,995	$ 3,182,000
Defined Benefit Plan, Actual Plan Asset Allocations		0.00%	0.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		1000.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		$ 0	$ 0
Other Postretirement Benefit Plans, Defined Benefit [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets		0	0
Other Postretirement Benefit Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		0.00%	0.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
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		$ 0	$ 518,000
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	0
Domestic Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		0	0
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		10,484,100	9,669,000
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		49,482,582	49,809,000
Domestic Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		0	0
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		3,479,189	3,342,000
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		741,242	1,572,000
International Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		0	0
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		7,290,215	6,773,000
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		8,046,705	7,755,000
International Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investment, Fair Value Disclosure		0	0
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		800,179	695,000
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		$ 1,050,867	$ 898,000

X

- Definition

Funded Status of Other Plans Recognized In Other Liabilities

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Fair value of investment in certain entities that calculate net asset value per share. Includes, but is not limited to, by unit, membership interest, or other ownership interest. Investment includes, but is not limited to, investment in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds. Excludes measurement of net asset value as estimate of fair value.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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-Name Accounting Standards Codification
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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of administration expense of defined benefit plan which decreases plan assets. Excludes plan administration expense paid by employer.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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