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Postretirement Obligations (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 24, 2017 | Sep. 25, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net Actuarial Gains/Losses, Amortization Next Twelve Months | $ 976,000 |  |
Postretirement assets, net | 16,157,000 | $ 15,392,000 |
Prior Service Cost, Amortization Next Twelve Months | 723,000 |  |
LTD Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 2,580,000 | $ 2,943,000 |
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | 1,302,000 |  |
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Next Twelve Months | (108,000) |  |
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Next Twelve Months | 1,194,000 |  |
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components | $ 18,000 |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year | 9.00% | 9.70% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate | 3.00% | 3.00% | 4.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.00% | 3.00% |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax | $ 12,224,000 | $ 12,304,000 |
Postretirement assets, net | 12,891,000 | 11,020,000 |
Liability, Defined Benefit Plan, Noncurrent | 0 | (2,061,000) |
Defined Benefit Plan, Benefit Obligation | 11,756,000 | 15,667,000 | $ 22,511,000
Defined Benefit Plan, Service Cost | 0 | 13,000 | 0
Defined Benefit Plan, Interest Cost | 365,000 | 412,000 | 1,000
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (1,080,000) | (1,056,000) | (1,000)
Post Retirement Plan, Amortization of Gain (Loss) | 984,000 | (987,000) | (1,093)
Post Retirement Benefit Plan, Amortization of Prior Service Cost (Credit) | (785,000) | (1,459,000) | (1,459)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (4,515,000) | (6,818,000) | (3,000)
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | (1,054,000) | (627,000) |
Defined Benefit Plan, Plan Assets, Benefits Paid | 1,399,000 | 1,527,000 |
Defined Benefit Plan, Accumulated Benefit Obligation, (Increase) Decrease for Settlement and Curtailment | (1,924,000) | (5,112,000) |
Defined Benefit Plan, Benefits Paid For Non-Participants | (1,209,000) | (834,000) |
Defined Benefit Plan, Prescription Drug Benefit, Net Periodic Postretirement Benefit Cost, (Increase) Decrease for Subsidy | 101,000 | (3,000) |
Defined Benefit Plan, Fair Value of Plan Assets | 24,647,000 | 24,626,000 | $ 24,123,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 2,106,000 | 2,112,000 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 422,000 | 755,000 |
Defined Benefit Plan, Benefits Paid Net Of Subsidy | (1,298,000) | (1,530,000) |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 12,891,000 | 8,959,000 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 17,917,000 | 18,782,000 |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost, before Tax | 5,693,000 | 6,478,000 |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax | $ 17,917,000 | $ 18,782,000 |
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 Rate of Return on Plan Assets | 5.00% | 5.00% | 5.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate | 4.50% | 4.50% |
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate | 2026 | 2026 |
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components | $ (17,000) |  |
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation | 456,000 |  |
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation | (417,000) |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 1,276,000 |  |
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Two | (107,000) |  |
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 2 | 1,169,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 1,241,000 |  |
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Three | (106,000) |  |
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 3 | 1,135,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 1,198,000 |  |
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Four | (103,000) |  |
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 4 | 1,095,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 1,147,000 |  |
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, Year Five | (99,000) |  |
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, Year 5 | 1,048,000 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | 4,794,000 |  |
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt, after Year Five | (408,000) |  |
Defined Benefit Plan, Expected Future Benefit Payments Net of Subsidy, After Year 5 | $ 4,386,000 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 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, Plan Assets, Target Allocation, Percentage | 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, Plan Assets, Target Allocation, Percentage | 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, Plan Assets, Target Allocation, Percentage | 1000.00% |  |
Defined Benefit Plan, Actual Plan Asset Allocations | 0.00% | 0.00% |

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- Definition Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment. + 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 (r) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 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) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1731-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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