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Business Combinations (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 02, 2014
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2016
Aug. 31, 2015
Business Acquisition [Line Items]          
Acquisition-related costs   $ 53,000 $ 662,000 $ 449,000 $ 3,180,000
Total revenue   102,018,000 94,637,000 287,617,000 264,836,000
Income (loss) before income taxes   12,318,000 7,429,000 28,181,000 (6,586,000)
Intangible assets, amortization expense   7,100,000 7,300,000 21,400,000 22,400,000
Stock-based compensation expense   5,779,000 6,538,000 19,009,000 18,812,000
Telerik AD [Member]          
Business Acquisition [Line Items]          
Total purchase consideration $ 262,500,000        
Total consideration paid to founders and key employees in restricted stock units $ 10,500,000        
Percent of total consideration deposited into escrow 10.00%        
Acquisition-related costs   300,000 800,000 300,000 2,700,000
Earn-out provision $ 2,200,000        
Service period 1 year        
Expense recognized related to contingent earn-out provisions   0 600,000 0 1,800,000
Total revenue   19,400,000 12,500,000 56,000,000 26,200,000
Income (loss) before income taxes   (7,000,000) (10,200,000) (20,200,000) (41,200,000)
Intangible assets, amortization expense   6,200,000 $ 6,200,000 18,500,000 $ 12,300,000
Stock-based compensation expense   $ 2,200,000   $ 6,500,000  
Credit Agreement [Member]          
Business Acquisition [Line Items]          
Term loan $ 150,000,000