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Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
May. 31, 2015
Nov. 30, 2014
Investments and Cash [Abstract]    
Due in one year or less $ 10,384 $ 11,140
Due after one year 22,717 9,046
Total $ 33,101 $ 20,186