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Postretirement Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2016
Postretirement Benefits Additional (Textual) [Abstract] |  |  |
Interest cost | $ 2,252 | $ 2,274 | $ 2,285
Amortization of prior service cost | 1,556 | 1,556 | 1,556
Service cost | 1,085 | 1,046 | 1,045
Amortization of net actuarial loss | 336 | 142 | 79
Total | 5,229 | 5,018 | 4,965
Liabilities related to postretirement benefit plan | $ 60,800 | $ 66,500 |
Discounted rate for benefit plan | 4.10% | 3.50% |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of insurance contracts | $ 73,721 | $ 75,236 |
2019 | 2,200 |  |
2020 | 2,500 |  |
2021 | 3,100 |  |
2022 | 3,200 |  |
2023 | 3,500 |  |
2024-2028 | 20,700 |  |
Supplemental Nonqualified Unfunded Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) | (900) | 3,900 | 400
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 1,600 | 1,500 | 1,400
Cash surrender value of insurance contracts | 44,400 | 46,800 |
Unfunded Death Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) | (300) | 1,500 | $ 200
Cash surrender value of insurance contracts | $ 18,200 | $ 18,500 |

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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6812-107765 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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 (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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 (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + 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)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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