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Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
Nov. 30, 2013
Investments and Cash [Abstract]    
Due in one year or less $ 11,140prgs_FairValueOfDebtSecuritiesMaturitiesWithinOneYear [1] $ 42,198prgs_FairValueOfDebtSecuritiesMaturitiesWithinOneYear [1]
Due after one year 9,046prgs_FairValueOfDebtSecuritiesMaturitiesAfterOneYear [2] 15,185prgs_FairValueOfDebtSecuritiesMaturitiesAfterOneYear [2]
Total $ 20,186prgs_FairValueOfDebtSecurities $ 57,383prgs_FairValueOfDebtSecurities
[1] Amounts as of November 30, 2013 include ARS which are tendered for interest-rate setting purposes periodically throughout the year.
[2] Includes state and municipal bond obligations, which are securities representing investments available for current operations and are classified as current in the consolidated balance sheets.