Restructuring and impairment charges - Charges Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 26, 2021	Jun. 27, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 959		$ (3,659)	$ 13,712	$ 16,692
Asset impairment charges		$ 6,700		6,739	0
Restructuring and impairment charges	959		(3,659)	20,451	16,692
Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	612		(4,413)	11,637	15,224
Asset impairment charges				0
Restructuring and impairment charges				11,637
Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	347		754	2,075	1,468
Asset impairment charges				6,739
Restructuring and impairment charges				8,814
Respiratory divestiture plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	125			2,666
Respiratory divestiture plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	126			2,666
Respiratory divestiture plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(1)			0
2021 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	268			7,180
2021 Restructuring plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	226			7,115
2021 Restructuring plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	42			65
2020 Workforce reduction plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(216)		10,348
2020 Workforce reduction plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges			(471)		10,093
2020 Workforce reduction plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			255		255
2019 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	95		(417)	331	826
2019 Footprint realignment plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9		(785)	49	367
2019 Footprint realignment plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	86		368	282	459
2018 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	201		(2,923)	2,064	5,069
2018 Footprint realignment plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	191		(3,006)	1,917	4,853
2018 Footprint realignment plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	10		83	147	216
Other restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	270		(103)	1,471	449
Other restructuring programs | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	60		(151)	(110)	(89)
Other restructuring programs | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 210		$ 48	$ 1,581	$ 538