Summary of Restructuring Costs for Each Segment and Unallocated Corporate Costs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				23 Months Ended
	Sep. 27, 2013		Sep. 28, 2012		Sep. 27, 2013		Sep. 28, 2012		Sep. 27, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 1,528		$ 2,728		$ 4,694		$ 7,396
2013 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	1,443				2,370
2013 Restructuring | Laser Products
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	767				938
2013 Restructuring | Precision Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	437				1,138
2013 Restructuring | Unallocated Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	239	[1]			294	[1]
2011 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	85		974		2,316		5,626
Cumulative Costs for Plan									10,340
2011 Restructuring | Laser Products
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	75		371		2,044		4,335
Cumulative Costs for Plan									8,119
2011 Restructuring | Precision Technologies
Restructuring Cost and Reserve [Line Items]
Restructuring Costs			452		53		652
Cumulative Costs for Plan									746
2011 Restructuring | Unallocated Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	10	[1]	151	[1]	219	[1]	639	[1]
Cumulative Costs for Plan									$ 1,475	[1]

[1] Represents consulting and severance restructuring costs related to corporate and shared service functions.