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v3.20.2

Commitments and contingent liabilities (Detail) $ in Millions | 6 Months Ended
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Jun. 28, 2020 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 | $ 0.7
Other Liability |
Loss Contingencies [Line Items] |
Accrual for environmental loss contingencies | $ 5.9

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