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Commitments and Contingencies (Additional Information) (Details 1)
$ in Millions
Nov. 30, 2017
USD ($)
Fiscal Years 2009 Through 2011 [Member]  
Loss Contingencies Line Items  
Potential additional income tax payment due $ 28.6
Fiscal Years 2012 through 2014 [Member]  
Loss Contingencies Line Items  
Potential additional income tax payment due $ 5.3