Postretirement Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of insurance contracts	$ 73,227	$ 73,849
2021	2,500
2022	2,600
2023	2,900
2024	3,100
2025	3,500
2026-2030	21,800
Liabilities related to postretirement benefit plan	$ 77,700	$ 69,300
Discounted rate for benefit plan	1.80%	2.70%
Supplemental Nonqualified Unfunded Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Recognized investment gains on the cash surrender value of the Retirement Plan life insurance contracts	$ (700)	$ (2,100)	$ 900
Benefits paid	1,900	1,800	1,600
Cash surrender value of insurance contracts	43,500	44,700
Unfunded Death Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Recognized investment gains on the cash surrender value of the Retirement Plan life insurance contracts	(300)	(900)	$ 300
Cash surrender value of insurance contracts	$ 18,800	18,400
Benefits paid		$ 1,700

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of payment to participant under defined benefit plan which decreases plan assets. 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.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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