Restructuring charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2016	Sep. 27, 2015	Sep. 25, 2016	Sep. 27, 2015	Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,027	$ 660	$ 12,876	$ 5,688
Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,784	324	12,027	4,011
2016 Other Restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring costs expected cash payment	500		500
Restructuring charges	1,713		1,713
Restructuring reserve	1,700		1,700
2016 Other Restructuring programs | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,713		1,713
2016 Other Restructuring programs | Accelerated Depreciation And Other Costs
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	1,000		1,000
2016 Other Restructuring programs | Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	2,500		2,500
2016 Other Restructuring programs | Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	3,500		3,500
2016 Manufacturing footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	925		11,279
Restructuring reserve	10,500		10,500
Restructuring expenses	2,800		15,500
2016 Manufacturing footprint realignment plan | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	851		10,919
Restructuring expenses	900		11,300
2016 Manufacturing footprint realignment plan | Accelerated Depreciation And Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	1,900		4,200
2016 Manufacturing footprint realignment plan | Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	34,000		34,000
Restructuring costs expected cash payment	27,000		27,000
2016 Manufacturing footprint realignment plan | Minimum | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	14,000		14,000
2016 Manufacturing footprint realignment plan | Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	44,000		44,000
Restructuring costs expected cash payment	31,000		31,000
2016 Manufacturing footprint realignment plan | Maximum | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	15,000		15,000
2015 Restructuring programs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	58	(74)	48	4,306
Aggregate restructuring charges incurred	6,400		6,400
Restructuring reserve	500		500
2015 Restructuring programs | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(103)	(198)	(502)	3,361
2014 Manufacturing footprint realignment plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	314	831	(101)	1,497
Aggregate restructuring charges incurred	10,800		10,800
Restructuring reserve	5,900		5,900
Restructuring expenses	2,800		6,800
2014 Manufacturing footprint realignment plan | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges	308	$ 619	(118)	$ 831
2014 Manufacturing footprint realignment plan | Accelerated Depreciation And Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	2,500		6,900
Restructuring charges reversal			100
2014 Manufacturing footprint realignment plan | Accelerated Depreciation And Other Costs | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Restructuring expenses			21,300
2014 Manufacturing footprint realignment plan | Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	43,000		43,000		$ 37,000
Restructuring costs expected cash payment	33,000		33,000		26,000
2014 Manufacturing footprint realignment plan | Minimum | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	11,000		11,000
2014 Manufacturing footprint realignment plan | Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	48,000		48,000		44,000
Restructuring costs expected cash payment	38,000		38,000		$ 31,000
2014 Manufacturing footprint realignment plan | Maximum | Employee termination benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	$ 12,000		$ 12,000