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Summary of Restructuring Costs for Each Segment and Unallocated Corporate Costs (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 17 Months Ended
--- | --- | ---
Mar. 29, 2013 | Mar. 30, 2012 | Mar. 29, 2013
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cumulative Costs for Plan |  |  |  |  | $ 9,649 |
Restructuring Costs | 2,051 |  | 2,217 |  |  |
Fiscal Year 2011 |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cumulative Costs for Plan |  |  |  |  | 9,649 |
Restructuring Costs | 1,625 |  | 2,208 |  |  |
Fiscal Year 2011 | Laser Products |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cumulative Costs for Plan |  |  |  |  | 7,541 |
Restructuring Costs | 1,466 |  | 2,127 |  |  |
Fiscal Year 2011 | Precision Technologies |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cumulative Costs for Plan |  |  |  |  | 726 |
Restructuring Costs | 33 |  | 29 |  |  |
Fiscal Year 2011 | Unallocated Restructuring Costs |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Cumulative Costs for Plan |  |  |  |  | 1,382 | [1]
Restructuring Costs | $ 126 | [1] | $ 52 | [1] |  |
[1] | Represents consulting and severance restructuring costs related to corporate and shared service functions.

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