Restructuring and impairment charges - Charges Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4,755	$ 19,005	$ 12,753	$ 20,351
Asset impairment charges	6,739		6,739	0
Restructuring and impairment charges	11,494	19,005	19,492	20,351
Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,823	18,601	11,025	19,637
Asset impairment charges	0		0
Restructuring and impairment charges	3,823		11,025
Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	932	404	1,728	714
Asset impairment charges	6,739		6,739
Restructuring and impairment charges	7,671		8,467
Respiratory divestiture plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,541		2,541
Respiratory divestiture plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,540		2,540
Respiratory divestiture plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1		1
2021 Restructuring plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	152		6,912
2021 Restructuring plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	129		6,889
2021 Restructuring plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	23		23
2020 Workforce reduction plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges		10,564		10,564
2020 Workforce reduction plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges		10,564		10,564
2020 Workforce reduction plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		0
2019 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(210)	405	236	1,243
2019 Footprint realignment plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(301)	323	40	1,152
2019 Footprint realignment plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	91	82	196	91
2018 Footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,551	7,597	1,863	7,992
2018 Footprint realignment plan | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,459	7,545	1,726	7,859
2018 Footprint realignment plan | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	92	52	137	133
Other restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	721	439	1,201	552
Other restructuring programs | Termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(4)	169	(170)	62
Other restructuring programs | Other Restructuring costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 725	$ 270	$ 1,371	$ 490