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Contingencies - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
California Case [Member]      
Loss Contingencies [Line Items]      
Litigation Settlement Amount $ 228.0    
U.S. Customs and Border Protection ("CBP") [Member] | Expected Litigation Loss [Member]      
Loss Contingencies [Line Items]      
Loss contingency amount     $ 39.3
Payments for legal settlements   $ 46.5  
Litigation settlement expense   $ 7.2