Restructuring and impairment charges - Charges recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 25, 2022	Sep. 26, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 628	$ 959	$ 1,453	$ 13,712
Asset impairment charges			1,497	6,739
Restructuring and impairment charges	628	959	2,950	20,451
Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	300	612	502	11,637
Asset impairment charges			0	0
Restructuring and impairment charges			502	11,637
Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	328	347	951	2,075
Asset impairment charges			1,497	6,739
Restructuring and impairment charges			2,448	8,814
Respiratory divestiture plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	145	125	425	2,666
Respiratory divestiture plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	123	126	358	2,666
Respiratory divestiture plan | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	22	(1)	67	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
2019 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(34)	95	(1,059)	331
2019 Footprint realignment plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(50)	9	(1,120)	49
2019 Footprint realignment plan | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	16	86	61	282
2018 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	455	201	1,061	2,064
2018 Footprint realignment plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	203	191	514	1,917
2018 Footprint realignment plan | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	252	10	547	147
Other restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	62	270	1,026	1,471
Other restructuring programs | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	24	60	750	(110)
Other restructuring programs | Other restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 38	$ 210	$ 276	$ 1,581