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Cash, Cash Equivalents and Investments (Investments with Continuous Unrealized Losses and Their Related Fair Values) (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
Nov. 30, 2013
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months $ 0 $ 0
Unrealized Losses, Less Than 12 Months 0 0
Fair Value, 12 Months or Greater 25,056 24,761
Unrealized Losses, 12 Months or Greater (3,694) (3,989)
Total, Fair Value 25,056 24,761
Total, Unrealized Losses (3,694) (3,989)
Auction rate securities - municipal bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 0 0
Unrealized Losses, Less Than 12 Months 0 0
Fair Value, 12 Months or Greater 22,187 21,933
Unrealized Losses, 12 Months or Greater (3,063) (3,317)
Total, Fair Value 22,187 21,933
Total, Unrealized Losses (3,063) (3,317)
Auction rate securities - student loans [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less Than 12 Months 0 0
Unrealized Losses, Less Than 12 Months 0 0
Fair Value, 12 Months or Greater 2,869 2,828
Unrealized Losses, 12 Months or Greater (631) (672)
Total, Fair Value 2,869 2,828
Total, Unrealized Losses $ (631) $ (672)