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Business Segments and International Operations (Revenue from External Customers from Different Geographical Areas) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Revenue from External Customer [Line Items]        
Total revenue $ 96,118 $ 88,817 $ 185,599 $ 170,198
North America [Member]        
Revenue from External Customer [Line Items]        
Total revenue 53,392 47,520 102,457 89,644
EMEA [Member]        
Revenue from External Customer [Line Items]        
Total revenue 31,577 31,146 62,798 59,010
Latin America [Member]        
Revenue from External Customer [Line Items]        
Total revenue 4,389 4,388 8,082 9,356
Asia Pacific [Member]        
Revenue from External Customer [Line Items]        
Total revenue $ 6,760 $ 5,763 $ 12,262 $ 12,188