Postretirement Obligations (Details) - USD ($)	12 Months Ended
Sep. 25, 2016	Sep. 27, 2015	Sep. 28, 2014
Defined Benefit Plan Disclosure [Line Items]
Net Actuarial Gains/Losses, Amortization Next Twelve Months	$ 1,016,000
Postretirement assets, net	14,063,000	$ 13,421,000
Prior Service Cost, Amortization Next Twelve Months	1,459,000
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
Prescription Drug Subsidy Receipts, Next Twelve Months	(200,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Next Twelve Months	3,400,000
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	$ 20,000
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%	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
Postretirement assets, net	9,138,000	13,420,000
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, 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, Actuarial Gain (Loss)	(773,000)	(1,149,000)
Defined Benefit Plan, Benefits Paid	(1,434,000)	(1,541,000)
Defined Benefit Plan, Benefits Paid For Non-Participants	(1,510,000)	(1,412,000)
Defined Benefit Plan, Assets Transferred to (from) Plan	(4,925,000)	0
Prescription Drug Benefit, Effect of Subsidy on Net Periodic Postretirement Benefit Cost	220,000	(2,000)
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, Contributions by Employer	563,000	745,000
Defined Benefit Plan, Benefits Paid Net Of Subsidy	(1,213,000)	(1,544,000)
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 Benefit Obligation, Expected Long-term Return on Assets	4.50%	4.50%
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, Ultimate Health Care Cost Trend Rate	4.50%	4.50%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2025	2025
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	$ (18,000)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	697,000
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	(629,000)
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	1,870,000
Prescription Drug Subsidy Receipts, Year Two	(210,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 2	1,660,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	1,910,000
Prescription Drug Subsidy Receipts, Year Three	(210,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 3	1,700,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	1,880,000
Prescription Drug Subsidy Receipts, Year Four	(210,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 4	1,670,000
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	1,790,000
Prescription Drug Subsidy Receipts, Year Five	(200,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 5	1,590,000
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	7,910,000
Prescription Drug Subsidy Receipts, after Year Five	(870,000)
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, After Year 5	$ 7,040,000
Other Postretirement Benefit Plans, Defined Benefit [Member] \| Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	2000.00%
Defined Benefit Plan, Actual Plan Asset Allocations	0.00%	0.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] \| Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	7000.00%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] \| Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	0.00%
Defined Benefit Plan, Actual Plan Asset Allocations	0.00%	0.00%
Other Postretirement Benefit Plans, Defined Benefit [Member] \| Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations	1000.00%
Defined Benefit Plan, Actual Plan Asset Allocations	0.00%	0.00%
LTD Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Funded Status of Plan	$ 3,190,000	$ 3,951,000

Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long-term Return on Assets

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Defined Benefit Plan, Benefits Paid For Non-Participants- Amount of benefits paid from trust for non-participants.

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Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, After Year 5

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Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Next Twelve Months

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Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 2

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Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 3

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Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 4

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Net Actuarial Gains/Losses, Amortization Next Twelve Months

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Prior Service Cost, Amortization Next Twelve Months

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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.

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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.

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

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

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Amount before tax, after reclassification adjustments, of prior service cost (credit) that has not been recognized in the income statement.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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Fair value of assets transferred into (out of) a defined benefit pension plan.

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

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

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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.

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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.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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Amount of contributions made by the employer to defined benefit plans.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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The ultimate trend rate for health care costs.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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Amount before tax, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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Amount of the effect of the government subsidy for prescription drug benefits on the measurement of net periodic postretirement benefit cost. That effect includes (1) any amortization of the actuarial experience gain, (2) the reduction in current period service cost due to the subsidy, and (3) the resulting reduction in interest cost on the accumulated postretirement benefit obligation as a result of the subsidy.

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Amount of the prescription drug subsidy receipts to be received after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the prescription drug subsidy receipts to be received in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of the prescription drug subsidy receipts to be received in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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