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Restructuring Charges (Narrative) (Details)
 3 Months Ended
Feb. 28, 2017
USD ($)
Feb. 29, 2016
USD ($)
Nov. 30, 2015
segment
May 31, 2015
USD ($)
Feb. 28, 2015
facility
Nov. 30, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses $ 17,139,000 $ (66,000)        
Restructuring reserve $ 12,136,000         $ 1,550,000
2017 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Global workforce reduction (as a percent) 20.00%          
Restructuring expenses $ 17,112,000          
Restructuring reserve 11,107,000         0
2017 Restructuring Activities [Member] | Other Accrued Liabilities [Member]            
Restructuring Cost and Reserve [Line Items]            
Short-term portion of restructuring reserve 11,000,000          
2017 Restructuring Activities [Member] | Other Noncurrent Liabilities [Member]            
Restructuring Cost and Reserve [Line Items]            
Long-term portion of restructuring reserve 100,000          
2016 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses 0          
Restructuring reserve 972,000         1,415,000
2015 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Number of facilities closed | facility         2  
Number of operating segments | segment     3      
Level 3 [Member] | Nonrecurring Basis [Member]            
Restructuring Cost and Reserve [Line Items]            
Long-lived assets at fair value       $ 100,000    
Telerik AD [Member]            
Restructuring Cost and Reserve [Line Items]            
Impairment of long-lived assets       $ 4,000,000    
Telerik AD [Member] | 2015 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses (17,000)          
Restructuring reserve 17,000         85,000
Severance [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses 16,079,000          
Restructuring reserve 11,698,000         1,443,000
Severance [Member] | 2017 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Expected additional restructuring costs 1,000,000          
Restructuring expenses 16,079,000          
Restructuring reserve 10,709,000         0
Severance [Member] | 2016 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve 972,000         1,415,000
Severance [Member] | Telerik AD [Member] | 2015 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses (11,000)          
Restructuring reserve 17,000         28,000
Facility-Related Charges [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses 1,060,000          
Restructuring reserve 438,000         107,000
Facility-Related Charges [Member] | 2017 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Expected additional restructuring costs 3,000,000          
Restructuring expenses 1,033,000          
Restructuring reserve 398,000         0
Facility-Related Charges [Member] | 2016 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring reserve 0         0
Facility-Related Charges [Member] | Telerik AD [Member] | 2015 Restructuring Activities [Member]            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses (6,000)          
Restructuring reserve $ 0         $ 57,000