Contingencies - Additional Information (Details) $ in Millions	2 Months Ended	12 Months Ended
	Jun. 21, 2017 Case	May 31, 2017 USD ($)
Subsequent Event [Member]
Loss Contingencies [Line Items]
Number of claims settled by the court | Case	20
Multidistrict Independent Contractor Litigation [Member] | Pending Litigation [Member] | Expected Litigation Loss Net of Insurance Claims [Member]
Loss Contingencies [Line Items]
Litigation Settlement Amount		$ 204.0
California Case [Member] | Pending Litigation [Member] | Expected Litigation Loss [Member]
Loss Contingencies [Line Items]
Litigation Settlement Amount		228.0
U.S. Customs and Border Protection [Member] | Expected Litigation Loss [Member]
Loss Contingencies [Line Items]
Loss contingency amount		$ 39.3