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Summary of the Basis Used to Measure Pension Plans' Assets at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Jan. 01, 2011 | Jan. 02, 2010
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Elgin Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | $ 3,188 |  | $ 3,342 | $ 3,189
Elgin Plan | Short Term Investment Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 169 | [1] |  |
Elgin Plan | Equity Securities | Large Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 768 |  |  |
Elgin Plan | Equity Securities | Mid Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 86 |  |  |
Elgin Plan | Equity Securities | Small Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 121 |  |  |
Elgin Plan | Equity Securities | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 607 |  |  |
Elgin Plan | Fixed Income | Govt/Corp |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 989 |  |  |
Elgin Plan | Fixed Income | High Yield |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 183 |  |  |
Elgin Plan | Alternative | Global Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 88 |  |  |
Elgin Plan | Alternative | Commodities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 177 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 3,019 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | Large Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 768 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | Mid Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 86 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | Small Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 121 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Equity Securities | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 607 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Fixed Income | Govt/Corp |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 989 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Fixed Income | High Yield |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 183 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Alternative | Global Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 88 |  |  |
Elgin Plan | Fair Value, Inputs, Level 1 | Alternative | Commodities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 177 |  |  |
Elgin Plan | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 169 |  |  |
Elgin Plan | Fair Value, Inputs, Level 2 | Short Term Investment Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 169 | [1] |  |
Smithville Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 7,820 |  | 8,253 | 7,526
Smithville Plan | Short Term Investment Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 | [1] |  |
Smithville Plan | Equity Securities | Large Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,895 |  |  |
Smithville Plan | Equity Securities | Mid Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 209 |  |  |
Smithville Plan | Equity Securities | Small Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 |  |  |
Smithville Plan | Equity Securities | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,535 |  |  |
Smithville Plan | Fixed Income | Govt/Corp |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 2,435 |  |  |
Smithville Plan | Fixed Income | High Yield |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 449 |  |  |
Smithville Plan | Alternative | Global Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 225 |  |  |
Smithville Plan | Alternative | Commodities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 416 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 7,492 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | Large Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,895 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | Mid Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 209 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | Small Cap |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Equity Securities | International |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,535 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Fixed Income | Govt/Corp |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 2,435 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Fixed Income | High Yield |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 449 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Alternative | Global Real Estate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 225 |  |  |
Smithville Plan | Fair Value, Inputs, Level 1 | Alternative | Commodities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 416 |  |  |
Smithville Plan | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 |  |  |
Smithville Plan | Fair Value, Inputs, Level 2 | Short Term Investment Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 328 | [1] |  |
Wrexham Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 11,518 |  |  |
Wrexham Plan | Short Term Investment Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 800 | [1] |  |
Wrexham Plan | Equity Securities | International Developed Markets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 2,008 |  |  |
Wrexham Plan | Equity Securities | International Emerging Markets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 341 |  |  |
Wrexham Plan | Equity Securities | International Global Markets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,604 |  |  |
Wrexham Plan | Equity Securities | United Kingdom |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 3,599 |  |  |
Wrexham Plan | Fixed Income | Govt/Corp |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,802 |  |  |
Wrexham Plan | Fixed Income | Aggregate Fair Value Under Fair Value Option |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 354 |  |  |
Wrexham Plan | Fixed Income | Index Linked |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,010 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 10,718 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | International Developed Markets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 2,008 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | International Emerging Markets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 341 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | International Global Markets |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,604 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 | Equity Securities | United Kingdom |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 3,599 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 | Fixed Income | Govt/Corp |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,802 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 | Fixed Income | Aggregate Fair Value Under Fair Value Option |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 354 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 1 | Fixed Income | Index Linked |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 1,010 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 2 |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | 800 |  |  |
Wrexham Plan | Fair Value, Inputs, Level 2 | Short Term Investment Fund |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of pension plan assets | $ 800 | [1] |  |
[1] | Represents collective short term investment fund, composed of high-grade money market instruments with short maturities.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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