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Restructuring Charges (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Nov. 30, 2017
Restructuring Cost and Reserve [Line Items]      
Restructuring expenses $ 1,821 $ 17,139  
2017 Restructuring Activities [Member]      
Restructuring Cost and Reserve [Line Items]      
Global workforce reduction (as a percent)     20.00%
2017 Restructuring Activities [Member] | Other Accrued Liabilities [Member]      
Restructuring Cost and Reserve [Line Items]      
Short-term portion of restructuring reserve 3,100    
2017 Restructuring Activities [Member] | Other Noncurrent Liabilities [Member]      
Restructuring Cost and Reserve [Line Items]      
Long-term portion of restructuring reserve $ 200