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Fair Value Measurements (Activity for Financial Assets Measured at Fair Value Using Level 3 Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Fair Value, Assets Measured on Recurring Basis, Level 3 Reconciliation [Roll Forward]    
Balance, beginning of period $ 24,761 $ 26,321
Redemptions and sales 0 (25)
Transfer to Level 2 fair value measurement 0 0
Unrealized gains included in accumulated other comprehensive loss 349 146
Balance, end of period $ 25,110 $ 26,442