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Fair Value Measurements (Hierarchy of Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Aug. 31, 2019 | Nov. 30, 2018
--- | --- | ---
Money market funds |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | $ 7,874 | $ 3,810
Money market funds | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Assets | 7,874 | 3,810
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 | 8,303 | 19,423
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 | 8,303 | 19,423
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 | 6,881 | 6,705
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 | 6,881 | 6,705
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 | 6,193 | 8,259
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 | 6,193 | 8,259
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 | (2,910) | (170)
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 | (2,910) | (170)
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 | (3,348) |
Interest rate swap | Level 1 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | 0 |
Interest rate swap | Level 2 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | (3,348) |
Interest rate swap | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities | $ 0 |

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