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Business Combinations (Schedule of Preliminary Allocation of the Purchase Price) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 0 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2010
Oct. 26, 2011
Corticon Technologies Inc [Member]
Oct. 26, 2011
Corticon Technologies Inc [Member]
Minimum [Member]
Y
Oct. 26, 2011
Corticon Technologies Inc [Member]
Maximum [Member]
Y
Jan. 08, 2010
Savvion Inc [Member]
Jan. 08, 2010
Savvion Inc [Member]
Minimum [Member]
Y
Jan. 08, 2010
Savvion Inc [Member]
Maximum [Member]
Y
Oct. 26, 2011
Scenario, Preliminary [Member]
Corticon Technologies Inc [Member]
Oct. 26, 2011
Scenario, Final [Member]
Corticon Technologies Inc [Member]
Business Acquisition [Line Items]                      
Accounts receivable             $ 5,120     $ 835 $ 835
Property and equipment                   112 112
Other assets             854     125 125
Acquired intangible assets             28,000     4,910 4,910
Deferred taxes             2,927     (1,814) 4,033
Goodwill       19,427     19,705     24,842 19,427
Accounts payable and other liabilities             (4,413)     (2,471) (2,903)
Deferred revenue                   (3,639) (3,639)
Liabilities assumed, net of other assets             (3,007)        
Net cash paid $ 0 $ 22,900 $ 49,186       $ 49,186     $ 22,900 $ 22,900
Acquired intangible assets life (in years)         3 7   7 9