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Restructuring Charges (Summary of Restructuring Activity) (Details) - USD ($)
 3 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Restructuring Reserve [Roll Forward]    
Beginning Balance $ 1,550,000  
Costs incurred 17,139,000 $ (66,000)
Cash disbursements (6,063,000)  
Asset Impairment Charges (457,000)  
Translation adjustments and other (33,000)  
Ending Balance 12,136,000  
Excess Facilities and Other Costs [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 107,000  
Costs incurred 1,060,000  
Cash disbursements (268,000)  
Asset Impairment Charges (457,000)  
Translation adjustments and other (4,000)  
Ending Balance 438,000  
Employee Severance and Related Benefits [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 1,443,000  
Costs incurred 16,079,000  
Cash disbursements (5,795,000)  
Asset Impairment Charges 0  
Translation adjustments and other (29,000)  
Ending Balance 11,698,000  
2017 Restructuring Activities [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 0  
Costs incurred 17,112,000  
Cash disbursements (5,515,000)  
Asset Impairment Charges (457,000)  
Translation adjustments and other (33,000)  
Ending Balance 11,107,000  
2017 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 0  
Costs incurred 1,033,000  
Cash disbursements (174,000)  
Asset Impairment Charges (457,000)  
Translation adjustments and other (4,000)  
Ending Balance 398,000  
2017 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 0  
Costs incurred 16,079,000  
Cash disbursements (5,341,000)  
Asset Impairment Charges 0  
Translation adjustments and other (29,000)  
Ending Balance 10,709,000  
2016 Restructuring Activities [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 1,415,000  
Costs incurred 0  
Cash disbursements (443,000)  
Ending Balance 972,000  
2016 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 0  
Cash disbursements 0  
Ending Balance 0  
2016 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 1,415,000  
Cash disbursements (443,000)  
Ending Balance 972,000  
Telerik AD [Member] | 2015 Restructuring Activities [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 85,000  
Costs incurred (17,000)  
Cash disbursements (51,000)  
Ending Balance 17,000  
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 57,000  
Costs incurred (6,000)  
Cash disbursements (51,000)  
Ending Balance 0  
Telerik AD [Member] | 2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]    
Restructuring Reserve [Roll Forward]    
Beginning Balance 28,000  
Costs incurred (11,000)  
Cash disbursements 0  
Ending Balance $ 17,000