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Amounts Reclassified Out of Accumulated Other Comprehensive Income - Reclassification out of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | $ (26,186) | $ (24,670) | $ (28,812)
Other comprehensive income before reclassifications |  | (2,805) | (3,723) | 1,612
Recognition in earnings of net actuarial loss for pension settlement |  | 1,051 | 0 | 0
Reclassifications to earnings |  | 2,164 | 2,207 | 2,530
Other comprehensive income (loss) |  | 410 | (1,516) | 4,142
Balance ending |  | (25,776) | (26,186) | (24,670)
Pension Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | (33,733) | (33,180) | (37,311)
Funded status benefit plan obligation |  | (3,052) | (4,019) | 448
Recognition in earnings of net actuarial loss for pension settlement | [1] | 1,051 | 0 | 0
Balance ending |  | (32,286) | (33,733) | (33,180)
Amortization of Net Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Reclassifications to earnings | [1] | 3,448 | 3,466 | 3,683
Other comprehensive income (loss) |  | 1,447 | (553) | 4,131
Post-Retirement Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | 7,547 | 8,510 | 8,499
Funded status benefit plan obligation |  | 247 | 296 | 1,164
Other comprehensive income (loss) |  | (1,037) | (963) | 11
Balance ending |  | 6,510 | 7,547 | 8,510
Amortization of Prior Service Credits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Reclassifications to earnings | [1] | (498) | (498) | (498)
Amortization of Net (Gain) [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Reclassifications to earnings | [1] | $ (786) | $ (761) | $ (655)
[1] | These amounts are included in the computation of net periodic benefit cost. See Note 12, “Employee Benefit Plans”.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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