Restructuring charges (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		13 Months Ended	33 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Jun. 28, 2015	Sep. 27, 2015
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 660	$ 1,108	$ 5,688	$ 16,511
Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges	324	567	4,011	17,209
Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	34	1	409	255
Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	241	409	1,141	(1,286)
Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	61	131	127	333
2015 Restructuring Program
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(74)		4,306
2015 Restructuring Program | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(198)		3,361
2015 Restructuring Program | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	37		166
2015 Restructuring Program | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	78		723
2015 Restructuring Program | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	9		56
2014 Manufacturing Footprint Realignment Plan
Restructuring Cost And Reserve [Line Items]
Restructuring charges	831	171	1,497	8,748
2014 Manufacturing Footprint Realignment Plan | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges	619	129	831	8,706
2014 Manufacturing Footprint Realignment Plan | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(3)	0	241	0
2014 Manufacturing Footprint Realignment Plan | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	163	0	389	0
2014 Manufacturing Footprint Realignment Plan | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	52	42	36	42
2014 European Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(97)	566	(53)	8,672
2014 European Restructuring Plan | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges	(97)	537	(87)	8,289
2014 European Restructuring Plan | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	1	0	1
2014 European Restructuring Plan | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	1	0	306
2014 European Restructuring Plan | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 0	27	34	76
Other 2014 Restructuring Programs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		289	49	2,070	$ 3,600
Other 2014 Restructuring Programs | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges		25	0	501
Other 2014 Restructuring Programs | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		0	0	0
Other 2014 Restructuring Programs | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		202	49	1,376
Other 2014 Restructuring Programs | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		62	0	193
LMA Restructuring Program
Restructuring Cost And Reserve [Line Items]
Restructuring charges		20	(17)	(3,352)		$ 11,300
LMA Restructuring Program | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges		0	0	(29)
LMA Restructuring Program | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		0	2	(112)
LMA Restructuring Program | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		20	(20)	(3,211)
LMA Restructuring Program | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		0	1	0
2013 Restructuring Program
Restructuring Cost And Reserve [Line Items]
Restructuring charges		62	(94)	626		$ 11,000
2013 Restructuring Program | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges		(124)	(94)	361
2013 Restructuring Program | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		0	0	0
2013 Restructuring Program | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		186	0	243
2013 Restructuring Program | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges		$ 0	$ 0	22
2012 Restructuring Program
Restructuring Cost And Reserve [Line Items]
Restructuring charges				(265)
2012 Restructuring Program | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges				(619)
2012 Restructuring Program | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges				354
2012 Restructuring Program | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges				0
2012 Restructuring Program | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges				0
2011 Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Restructuring charges				12
2011 Restructuring Plan | Termination Benefits
Restructuring Cost And Reserve [Line Items]
Restructuring charges				0
2011 Restructuring Plan | Facility Closure Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges				12
2011 Restructuring Plan | Contract Termination Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges				0
2011 Restructuring Plan | Other Exit Costs
Restructuring Cost And Reserve [Line Items]
Restructuring charges				$ 0