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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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