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Commitments and contingent liabilities (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 27, 2021
Mar. 28, 2021
Sep. 26, 2021
Loss Contingencies [Line Items]      
Estimated litigation liability     $ 0.7
Reversal accrued penalties and interest     3.0
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
Minimum | China Investigation Penalties For Tariffs And Related Interest      
Loss Contingencies [Line Items]      
Loss contingency accrual, unpaid tariff, penalties percentage     30.00%
Loss contingency, estimate of possible loss     $ 3.0
Maximum      
Loss Contingencies [Line Items]      
Estimated time frame over which accrued amounts may be paid out     15 years
Maximum | China Investigation Penalties For Tariffs And Related Interest      
Loss Contingencies [Line Items]      
Loss contingency accrual, unpaid tariff, penalties percentage     200.00%
Loss contingency, estimate of possible loss     $ 20.0
Accrued Liabilities      
Loss Contingencies [Line Items]      
Accrual for environmental loss contingencies     1.6
Other Liability      
Loss Contingencies [Line Items]      
Accrual for environmental loss contingencies     $ 5.2