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Postretirement Obligations (Tables) - Other Postretirement Benefit Plans, Defined Benefit [Member] | 12 Months Ended
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Sep. 24, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The net periodic postretirement benefit cost (benefit) components for our postretirement plans are as follows:
(Thousands of Dollars) | 2017 |  |  | 2016 |  |  | 2015 |
Service cost for benefits earned during the year | 13 |  |  | 63 |  |  | 76 |
Interest cost on projected benefit obligation | 412 |  |  | 623 |  |  | 922 |
Expected return on plan assets | (1,056 | ) |  | (1,322 | ) |  | (1,445 | )
Amortization of net actuarial gain | (987 | ) |  | (1,093 | ) |  | (1,386 | )
Amortization of prior service benefit | (1,459 | ) |  | (1,459 | ) |  | (1,459 | )
Curtailment gains | (3,741 | ) |  | — |  |  | — |
Net periodic postretirement benefit | (6,818 | ) |  | (3,188 | ) |  | (3,292 | )
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] | Changes in benefit obligations and plan assets are as follows:
(Thousands of Dollars) | 2017 |  |  | 2016 |
Benefit obligation, beginning of year | 22,511 |  |  | 23,812 |
Service cost | 13 |  |  | 63 |
Interest cost | 412 |  |  | 623 |
Actuarial loss (gain) | (627 | ) |  | (773 | )
Benefits paid, net of premiums received | (1,527 | ) |  | (1,434 | )
Curtailment | (5,112 | ) |  | — |
Medicare Part D subsidies | (3 | ) |  | 220 |
Benefit obligation, end of year | 15,667 |  |  | 22,511 |
Fair value of plan assets, beginning of year | 24,123 |  |  | 30,123 |
Actual return on plan assets | 2,112 |  |  | 1,085 |
Employer contributions | 755 |  |  | 563 |
Benefits paid, net of premiums and Medicare Part D subsidies received | (1,530 | ) |  | (1,213 | )
Benefits paid for active employees | (834 | ) |  | (1,510 | )
Allocation to active medical plans | — |  |  | (4,925 | )
Fair value of plan assets at measurement date | 24,626 |  |  | 24,123 |
Funded status | 8,959 |  |  | 1,612 |
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] | Disaggregated amounts recognized in the Consolidated Balance Sheets are as follows:
(Thousands of Dollars) | September 24 2017 |  |  | September 25 2016 |
Non-current assets | 11,020 |  |  | 9,138 |
Postretirement benefit obligations | (2,061 | ) |  | (7,527 | )
Accumulated other comprehensive income (before income tax benefit) | 18,782 |  |  | 19,026 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Amounts recognized in accumulated other comprehensive income are as follows:
(Thousands of Dollars) | September 24 2017 |  |  | September 25 2016 |
Unrecognized net actuarial gain | 12,304 |  |  | 11,089 |
Unrecognized prior service benefit | 6,478 |  |  | 7,937 |
| 18,782 |  |  | 19,026 |
Schedule of Assumptions Used [Table Text Block] | Weighted-average assumptions used to determine net periodic benefit cost are as follows:
(Percent) | 2017 |  |  | 2016 |  |  | 2015 |
Discount rate | 3.1 |  |  | 3.7 |  |  | 3.7 |
Expected long-term return on plan assets | 4.5 |  |  | 4.5 |  |  | 4.5 |
Weighted-average assumptions used to determine post retirement benefit obligations are as follows:
(Percent) | September 24 2017 |  | September 25 2016
Discount rate | 3.4 |  | 3.1
Expected long-term return on plan assets | 4.5 |  | 4.5
Schedule of Health Care Cost Trend Rates [Table Text Block] | Assumed health care cost trend rates are as follows:
(Percent) | September 24 2017 |  | September 25 2016
Health care cost trend rates | 9.7 |  | 9.0
Rate to which the cost trend rate is assumed to decline (the “Ultimate Trend Rate”) | 4.5 |  | 4.5
Year in which the rate reaches the Ultimate Trend Rate | 2026 |  | 2025
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | A one percentage point change in assumed health care cost trend rates would have the following annualized effects on reported amounts for 2017:
| One Percentage Point |
(Thousands of Dollars) | Increase |  |  | Decrease |
Effect on net periodic postretirement benefit | 19 |  |  | (17 | )
Effect on postretirement benefit obligation | 578 |  |  | (526 | )
Schedule of Allocation of Plan Assets [Table Text Block] | The weighted-average asset allocation of our postretirement assets is as follows:
(Percent) | Policy Allocation |  | Actual Allocation
Asset Class | September 24 2017 |  | September 24 2017 | September 25 2016
Equity securities | 20 |  | 21 | 22
Debt securities | 70 |  | 67 | 65
Hedge fund investment | 10 |  | 12 | 11
Cash and cash equivalents | — |  | — | 2
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] | The fair value hierarchy of postretirement assets at September 24, 2017 is as follows:
(Thousands of Dollars) | NAV |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and cash equivalents | — |  | — |  | — |  | — |
Domestic equity securities | — |  | 3,479 |  | 741 |  | — |
International equity securities | — |  | 800 |  | 1,051 |  | — |
Debt securities | — |  | 19,548 |  | — |  | — |
Hedge fund investment | 3,343 |  | — |  | — |  | — |
The fair value hierarchy of postretirement assets at September 25, 2016 is as follows:
(Thousands of Dollars) | NAV |  | Level 1 |  | Level 2 |  | Level 3 |
Cash and cash equivalents | — |  | 518 |  | — |  | — |
Domestic equity securities | — |  | 3,342 |  | 1,572 |  | — |
International equity securities | — |  | 695 |  | 898 |  | — |
Debt securities | — |  | 18,840 |  | — |  | — |
Hedge fund investment | 3,182 |  | — |  | — |  | — |
Schedule of Expected Benefit Payments [Table Text Block] | We anticipate future benefit payments to be paid either with future contributions to the plan or directly from plan assets, as follows:
(Thousands of Dollars) | Gross Payments |  |  | Less Medicare Part D Subsidy |  |  | Net Payments |
2018 | 3,474 |  |  | (167 | ) |  | 3,307 |
2019 | 1,393 |  |  | (168 | ) |  | 1,225 |
2020 | 1,372 |  |  | (168 | ) |  | 1,204 |
2021 | 1,340 |  |  | (166 | ) |  | 1,174 |
2022 | 1,298 |  |  | (162 | ) |  | 1,136 |
2023-2027 | 5,582 |  |  | (695 | ) |  | 4,887 |

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- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or 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 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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