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Employee Benefit Plans - Amounts recognized in balance sheet (Details) - USD ($) | Nov. 29, 2020 | Nov. 24, 2019
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Pension plans, defined benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | $ 62,161,000 | $ 27,704,000
Accrued benefit liability – current portion | (9,663,000) | (9,480,000)
Accrued benefit liability – long-term portion | (163,836,000) | (188,825,000)
Amount recognized in balance sheet | (111,338,000) | (170,601,000)
Accumulated other comprehensive loss: |  |
Net actuarial loss | (296,330,000) | (358,484,000)
Net prior service benefit | 259,000 | 291,000
Other comprehensive income (loss) | (296,071,000) | (358,193,000)
Other postretirement benefit plans, defined benefit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0
Accrued benefit liability – current portion | (7,112,000) | (8,129,000)
Accrued benefit liability – long-term portion | (60,249,000) | (64,006,000)
Amount recognized in balance sheet | (67,361,000) | (72,135,000)
Accumulated other comprehensive loss: |  |
Net actuarial loss | (12,491,000) | (11,284,000)
Net prior service benefit | 0 | 0
Other comprehensive income (loss) | $ (12,491,000) | $ (11,284,000)

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 + Details
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