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Commitments and contingent liabilities (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2021 | Mar. 28, 2021 | Jun. 27, 2021
Loss Contingencies [Line Items] |  |  |
Estimated litigation liability | $ 0.4 |  | $ 0.4
Essential Medical, Inc. |  |  |
Loss Contingencies [Line Items] |  |  |
Settlement payment | 17.4 |  | $ 17.4
Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Money damages sought |  | $ 66.9 |
Minimum |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated time frame over which accrued amounts may be paid out |  |  | 10 years
Maximum |  |  |
Loss Contingencies [Line Items] |  |  |
Estimated time frame over which accrued amounts may be paid out |  |  | 15 years
Accrued Liabilities |  |  |
Loss Contingencies [Line Items] |  |  |
Accrual for environmental loss contingencies | 1.6 |  | $ 1.6
Other Liability |  |  |
Loss Contingencies [Line Items] |  |  |
Accrual for environmental loss contingencies | $ 4.9 |  | $ 4.9

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