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Fair Value Measurements (Fair Value Measurements within the Fair Value Hierarchy of the Financial Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2014
Nov. 30, 2013
Contingent consideration [Member] | Total Fair Value [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial liabilities $ (393) $ (388)
Contingent consideration [Member] | Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial liabilities 0 0
Contingent consideration [Member] | Level 2 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial liabilities 0 0
Contingent consideration [Member] | Level 3 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial liabilities (393) (388)
Money market funds [Member] | Total Fair Value [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 58,557 54,513
Money market funds [Member] | Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 58,557 54,513
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] | Total Fair Value [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 28,693 31,102
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 28,693 31,102
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
Auction rate securities - municipal bonds [Member] | Total Fair Value [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 22,233 23,453
Auction rate securities - municipal bonds [Member] | Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 0 0
Auction rate securities - municipal bonds [Member] | Level 2 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 0 1,520
Auction rate securities - municipal bonds [Member] | Level 3 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 22,233 21,933
Auction rate securities - student loans [Member] | Total Fair Value [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 2,877 2,828
Auction rate securities - student loans [Member] | Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 0 0
Auction rate securities - student loans [Member] | Level 2 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 0 0
Auction rate securities - student loans [Member] | Level 3 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 2,877 2,828
Corporate bonds [Member] | Total Fair Value [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets   171
Corporate bonds [Member] | Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets   0
Corporate bonds [Member] | Level 2 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets   171
Corporate bonds [Member] | Level 3 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets   0
Foreign exchange contract [Member] | Total Fair Value [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets (116)  
Foreign exchange contract [Member] | Level 1 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets 0  
Foreign exchange contract [Member] | Level 2 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets (116)  
Foreign exchange contract [Member] | Level 3 [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value of financial assets $ 0