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Pensions (Details) - USD ($)	12 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Sep. 27, 2015	Sep. 28, 2014
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months		$ 12,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		4.00%	4.00%	5.00%
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	$ 2,947,000	$ (55,241,000)	$ (48,031,000)
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		53,027,000	50,463,000
Defined Benefit Plan, Benefit Obligation		202,158,000	193,751,000	$ 199,197,000
Defined Benefit Plan, Accumulated Benefit Obligation			193,751,000
Defined Benefit Plan, Service Cost		197,000	232,000	156,000
Defined Benefit Plan, Interest Cost		6,061,000	8,122,000	7,996,000
Defined Benefit Plan, Actuarial Gain (Loss)		13,630,000	(2,543,000)
Defined Benefit Plan, Benefits Paid		(11,481,000)	(11,257,000)
Defined Benefit Plan, Administration Expenses		(2,099,000)	(1,862,000)
Defined Benefit Plan, Contributions by Employer		4,604,000	3,577,000
Defined Benefit Plan, Expected Return on Plan Assets		(8,698,000)	(9,863,000)	(9,932,000)
Defined Benefit Plan, Amortization of Net Gains (Losses)		(2,397,000)	1,682,000	423,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)		(136,000)	(136,000)	(136,000)
Defined Benefit Plan, Net Periodic Benefit Cost		(179,000)	37,000	(1,493,000)
Defined Benefit Plan, Fair Value of Plan Assets		149,131,000	143,288,000	$ 151,013,000
Defined Benefit Plan, Actual Return on Plan Assets		14,819,000	1,817,000
Defined Benefit Plan, Funded Status of Plan		53,027,000	50,463,000
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax		(54,862,000)	(47,515,000)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax	$ (137,000)	379,000	516,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		$ (54,862,000)	$ (47,515,000)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		6.00%	7.00%	7.00%
Defined Benefit Plan, Expected Future Benefit Payments, Year Two		$ 12,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three		12,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four		12,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five		12,000
Defined Benefit Plan, Expected Future Benefit Payments, 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%	46.00%
Defined Benefit Plan, Target Plan Asset Allocations		5000.00%
Pension Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, Fair Value Disclosure		$ 14,557,858	$ 17,246,000
Defined Benefit Plan, Actual Plan Asset Allocations		33.00%	37.00%
Defined Benefit Plan, Target Plan Asset Allocations		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		$ 25,611,947	$ 31,196,000
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		9,647,704	4,124,000
Pension Plans, Defined Benefit [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		4.00%	4.00%
Defined Benefit Plan, Target Plan Asset Allocations		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		$ 6,882,655	$ 6,450,000
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 Investments, Fair Value Disclosure		$ 17,530,708	$ 17,344,000
Defined Benefit Plan, Actual Plan Asset Allocations		11.00%	11.00%
Defined Benefit Plan, Target Plan Asset Allocations		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 Investments, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		2.00%	2.00%
Defined Benefit Plan, Target Plan Asset Allocations		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		$ 2,757,205	$ 2,407,000
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 Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months		$ 3,600,000
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		3.00%	4.00%
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax		$ 11,089,000	$ 13,155,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent		7,527,000	7,109,000
Defined Benefit Plan, Benefit Obligation		22,511,000	23,812,000	$ 25,506,000
Defined Benefit Plan, Service Cost		63,000	76,000	1,000
Defined Benefit Plan, Interest Cost		623,000	922,000	1,000
Defined Benefit Plan, Actuarial Gain (Loss)		(773,000)	(1,149,000)
Defined Benefit Plan, Benefits Paid		(1,434,000)	(1,541,000)
Defined Benefit Plan, Contributions by Employer		563,000	745,000
Defined Benefit Plan, Expected Return on Plan Assets		(1,322,000)	(1,445,000)	(1,000)
Defined Benefit Plan, Amortization of Net Gains (Losses)		1,093,000	(1,386,000)	(2,000)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit)		(1,459,000)	(1,459,000)	(1,000)
Defined Benefit Plan, Net Periodic Benefit Cost		(3,188,000)	(3,292,000)	(3,000)
Defined Benefit Plan, Fair Value of Plan Assets		24,123,000	30,123,000	$ 32,881,000
Defined Benefit Plan, Actual Return on Plan Assets		1,085,000	(547,000)
Defined Benefit Plan, Funded Status of Plan		(1,612,000)	(6,311,000)
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax		19,026,000	22,551,000
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax		7,937,000	9,396,000
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax		$ 19,026,000	$ 22,551,000
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets		5.00%	5.00%	5.00%
Defined Benefit Plan, Expected Future Benefit Payments, Year Two		$ 1,870,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three		1,910,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four		1,880,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five		1,790,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter		$ 7,910,000
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, Target Plan Asset Allocations		2000.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		100.00%	100.00%
Defined Benefit Plan, Target Plan Asset Allocations		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		$ 18,839,723	$ 13,910,000
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	6,581,000
Other Postretirement Benefit Plans, Defined Benefit [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, Fair Value Disclosure		$ 3,182,158	$ 3,072,000
Defined Benefit Plan, Actual Plan Asset Allocations		0.00%	0.00%
Defined Benefit Plan, Target Plan Asset Allocations		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 Investments, Fair Value Disclosure		$ 0	$ 0
Defined Benefit Plan, Actual Plan Asset Allocations		0.00%	0.00%
Defined Benefit Plan, Target Plan Asset Allocations		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		$ 518,390	$ 790,000
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
Other Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status of Plan		2,232,000	2,337,000
Funded Status of Other Plans Recognized In Other Liabilities		113,000	278,000
Domestic Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, 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		9,669,029	8,153,000
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		49,808,722	44,470,000
Domestic Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, 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		3,341,719	2,896,000
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		1,572,216	1,372,000
International Equity Securities [Member] | Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, 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		6,773,276	6,286,000
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		7,754,656	7,389,000
International Equity Securities [Member] | Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Alternative Investments, 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		695,163	645,000
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		$ 898,457	$ 857,000

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- Definition

Funded Status of Other Plans Recognized In Other Liabilities

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No definition available.

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Fair value of investments in certain entities that calculate net asset value per share, including, but not limited to, by unit, membership interest, or other ownership interest. Investments include, but are not limited to, investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 6A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=SL6742756-110258

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accumulated Benefit Obligation
-URI http://asc.fasb.org/extlink&oid=6503844

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (i-k)
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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)
-URI http://asc.fasb.org/extlink&oid=6504192

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 715
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)
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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Gain or Loss
-URI http://asc.fasb.org/extlink&oid=49168827

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Amount of plan administration expenses deducted from total plan assets.

+ References

No definition available.

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Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Paragraph 10A
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Amount before tax, after reclassification adjustments, of prior service cost (credit) that has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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The interest rate used to adjust for the time value of money.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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