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Fair Value Measurements (Hierarchy of Financial Assets) (Details) - USD ($) $ in Thousands | Feb. 29, 2020 | Nov. 30, 2019
--- | --- | ---
Money market funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | $ 13,600 | $ 9,913
Money market funds | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 13,600 | 9,913
Money market funds | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Money market funds | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
State and municipal bond obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 3,563 | 7,037
State and municipal bond obligations | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
State and municipal bond obligations | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 3,563 | 7,037
State and municipal bond obligations | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
U.S. treasury bonds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 5,805 | 7,231
U.S. treasury bonds | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
U.S. treasury bonds | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 5,805 | 7,231
U.S. treasury bonds | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Corporate bonds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 6,593 | 5,158
Corporate bonds | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Corporate bonds | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 6,593 | 5,158
Corporate bonds | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 0 | 0
Foreign exchange derivatives |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (1,019) | (80)
Foreign exchange derivatives | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | 0 | 0
Foreign exchange derivatives | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (1,019) | (80)
Foreign exchange derivatives | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | 0 | 0
Interest rate swap |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (4,868) | (2,054)
Interest rate swap | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | 0 | 0
Interest rate swap | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (4,868) | (2,054)
Interest rate swap | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | $ 0 | $ 0

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