Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Thousands	Aug. 31, 2020 USD ($)	Nov. 30, 2019 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment in limited partnership	$ 152,450	$ 137,849	[1]
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment in limited partnership	152,450	$ 137,849
Investment in limited partnership aggregate death benefit	$ 663,033
Level 3 | Discounted cash flow | Discount rate
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Investment in limited partnership measurement input	0.1404

[1] Derived from audited consolidated financial statements.