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Accumulated Other Comprehensive Loss (Details)
$ in Thousands
3 Months Ended
Feb. 28, 2017
USD ($)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance, December 1, 2016 $ 406,629
Balance, February 28, 2017 386,186
Accumulated Other Comprehensive Loss [Member]  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance, December 1, 2016 (28,561)
Other comprehensive loss before reclassifications, net of tax 1,299
Balance, February 28, 2017 (27,262)
Foreign Currency Translation Adjustment [Member]  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance, December 1, 2016 (28,425)
Other comprehensive loss before reclassifications, net of tax 1,228
Balance, February 28, 2017 (27,197)
Unrealized Gains (Losses) on Investments [Member]  
Accumulated Other Comprehensive Income (Loss) [Roll Forward]  
Balance, December 1, 2016 (136)
Other comprehensive loss before reclassifications, net of tax 71
Balance, February 28, 2017 $ (65)