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Commitments and contingencies - Additional information (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2016 employee | Aug. 31, 2016 lawsuit | Feb. 03, 2018 employee
EPA Collective Action |  |  |
Loss Contingencies [Line Items] |  |  |
Number of employees opted in lawsuit | employee | 10,314 |  | 9,124
S.D.N.Y. Cases |  |  |
Loss Contingencies [Line Items] |  |  |
New claims filed, number | lawsuit |  | 2 |

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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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- Details
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