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Fair Value Measurements (Fair Value Measurements within the Fair Value Hierarchy of the Financial Assets) (Details) - USD ($) $ in Thousands | Aug. 31, 2016 | Nov. 30, 2015
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Foreign exchange contract [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial liabilities | $ (5,166) | $ (4,021)
Foreign exchange contract [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 contract [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial liabilities | (5,166) | (4,021)
Foreign exchange contract [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 | 8,536 | 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 | 8,536 | 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 | 34,532 | 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 | 34,532 | 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
U.S. treasury bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 6,534 | 3,094
U.S. 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
U.S. treasury bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 6,534 | 3,094
U.S. 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
U.S. government agency bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 522 | 1,641
U.S. 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 | 0
U.S. government agency bonds [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 522 | 1,641
U.S. 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 | 0
Corporate bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair value of financial assets | 3,012 | 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 | 3,012 | 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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