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Fair Value Measurements (Fair Value Measurements within the Fair Value Hierarchy of the Financial Assets) (Details) - USD ($) $ in Thousands | Nov. 30, 2016 | Nov. 30, 2015
--- | --- | ---
Foreign Exchange Derivatives [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial liabilities | $ (6,616) | $ (4,021)
Foreign Exchange Derivatives [Member] | Level 1 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial liabilities | 0 | 0
Foreign Exchange Derivatives [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial liabilities | (6,616) | (4,021)
Foreign Exchange Derivatives [Member] | Level 3 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial liabilities | 0 | 0
Money Market Funds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 10,173 | 26,138
Money Market Funds [Member] | Level 1 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 10,173 | 26,138
Money Market Funds [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 0 | 0
Money Market Funds [Member] | Level 3 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 0 | 0
State and Municipal Bond Obligations [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 32,724 | 20,417
State and Municipal Bond Obligations [Member] | Level 1 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 0 | 0
State and Municipal Bond Obligations [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 32,724 | 20,417
State and Municipal Bond Obligations [Member] | Level 3 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 0 | 0
US Treasury Bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 6,513 | 3,094
US Treasury Bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 0 | 0
US Treasury Bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 6,513 | 3,094
US Treasury Bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 0 | 0
US Government Agency Bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets |  | 1,641
US Government Agency Bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets |  | 0
US Government Agency Bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets |  | 1,641
US Government Agency Bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets |  | 0
Corporate Bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 3,481 | 3,748
Corporate Bonds [Member] | Level 1 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 0 | 0
Corporate Bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 3,481 | 3,748
Corporate Bonds [Member] | Level 3 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | $ 0 | $ 0

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