Restructuring and impairment charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 27, 2021	Sep. 26, 2021	Sep. 27, 2020
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 6,700	$ 6,739	$ 0
Termination benefits | Respiratory divestiture plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		2,600
Termination benefits | 2021 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		4,100
Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Asset impairment charges		6,739
Minimum | Respiratory divestiture plan
Restructuring Cost and Reserve [Line Items]
Aggregate capital expenditures		22,000
Expected restructuring charges		24,000
Minimum | Termination benefits | 2021 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges		7,000
Minimum | Other Restructuring costs | 2021 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges		3,000
Maximum | Respiratory divestiture plan
Restructuring Cost and Reserve [Line Items]
Aggregate capital expenditures		28,000
Expected restructuring charges		30,000
Maximum | Termination benefits | 2021 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges		9,000
Maximum | Other Restructuring costs | 2021 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges		$ 4,000