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Commitments and contingent liabilities (Detail) $ in Millions | 9 Months Ended
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Sep. 29, 2019 USD ($)
Loss Contingencies [Line Items] |
Estimated litigation liability | $ 0.2
Minimum |
Loss Contingencies [Line Items] |
Estimated time fram over which accrued amounts may be paid out | 10 years
Maximum |
Loss Contingencies [Line Items] |
Estimated time fram over which accrued amounts may be paid out | 15 years
Accrued Liabilities |
Loss Contingencies [Line Items] |
Accrual for environmental loss contingencies | $ 0.9
Other Liability |
Loss Contingencies [Line Items] |
Accrual for environmental loss contingencies | $ 6.3

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