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