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Restructuring Charges (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring expense $ 135 $ 923 $ 2,382 $ 18,724
Other accrued liabilities        
Restructuring Cost and Reserve [Line Items]        
Short-term portion of restructuring reserve 500   500  
Other Noncurrent Liabilities        
Restructuring Cost and Reserve [Line Items]        
Long-term portion of restructuring reserve $ 100   $ 100  
2017 Restructuring Activities        
Restructuring Cost and Reserve [Line Items]        
Global workforce reduction (as a percent) (over)       20.00%