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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Mar. 31, 2012
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2011
Jan. 21, 2010
Subsidiaries
Defendants
Commitments and Contingencies Disclosure [Abstract]          
Rent expense, net of sub-rental income   $ 6.5 $ 8.7 $ 10.3  
Number Of Subsidiaries Alleging Infringement         2
Number Of Defendants Alleging Infringement Other Than Subsidiaries         19
Settlement amount with JuxaComm $ 0.9