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Restructuring Charges (Summary of Restructuring Activity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2015
Aug. 31, 2014
Restructuring Reserve [Roll Forward]        
Beginning Balance     $ 1,643  
Costs incurred $ 2,561 $ 1,680 8,715 $ 2,001
Cash disbursements     (4,098)  
Asset impairment     (3,999)  
Translation adjustments and other     50  
Ending Balance 2,311   2,311  
Excess Facilities and Other Costs [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     416  
Costs incurred     4,403  
Cash disbursements     (447)  
Asset impairment     (3,999)  
Translation adjustments and other     83  
Ending Balance 456   456  
Employee Severance and Related Benefits [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     1,227  
Costs incurred     4,312  
Cash disbursements     (3,651)  
Asset impairment     0  
Translation adjustments and other     (33)  
Ending Balance 1,855   1,855  
2015 Restructuring Activities [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     0  
Costs incurred 2,500   7,407  
Cash disbursements     (1,541)  
Asset impairment     (3,999)  
Translation adjustments and other     104  
Ending Balance 1,971   1,971  
2015 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     0  
Costs incurred     4,299  
Cash disbursements     (143)  
Asset impairment     (3,999)  
Translation adjustments and other     102  
Ending Balance 259   259  
2015 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     0  
Costs incurred     3,108  
Cash disbursements     (1,398)  
Asset impairment     0  
Translation adjustments and other     2  
Ending Balance 1,712   1,712  
2014 Restructuring Activities [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     1,227  
Costs incurred     1,335 1,500
Cash disbursements     (2,314)  
Translation adjustments and other     (35)  
Ending Balance 213   213  
2014 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     0  
Costs incurred     131  
Cash disbursements     (61)  
Translation adjustments and other     0  
Ending Balance 70   70  
2014 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     1,227  
Costs incurred     1,204  
Cash disbursements     (2,253)  
Translation adjustments and other     (35)  
Ending Balance 143   143  
2012 and 2013 Restructuring Activities [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     416  
Costs incurred     (27) $ 500
Cash disbursements     (243)  
Translation adjustments and other     (19)  
Ending Balance 127   127  
2012 and 2013 Restructuring Activities [Member] | Excess Facilities and Other Costs [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     416  
Costs incurred     (27)  
Cash disbursements     (243)  
Translation adjustments and other     (19)  
Ending Balance 127   127  
2012 and 2013 Restructuring Activities [Member] | Employee Severance and Related Benefits [Member]        
Restructuring Reserve [Roll Forward]        
Beginning Balance     0  
Costs incurred     0  
Cash disbursements     0  
Translation adjustments and other     0  
Ending Balance $ 0   $ 0