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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rent expense, net of sub-rental income $ 6.8 $ 6.9 $ 8.0