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Restructuring Charges (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2018
May 31, 2017
Feb. 28, 2017
May 31, 2018
May 31, 2017
Restructuring Cost and Reserve [Line Items]          
Restructuring expense $ 426 $ 662   $ 2,247 $ 17,801
Other accrued liabilities          
Restructuring Cost and Reserve [Line Items]          
Short-term portion of restructuring reserve 1,000     1,000  
Other Noncurrent Liabilities          
Restructuring Cost and Reserve [Line Items]          
Long-term portion of restructuring reserve $ 200     $ 200  
2017 Restructuring Activities          
Restructuring Cost and Reserve [Line Items]          
Global workforce reduction (as a percent) (over)     20.00%