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Employee Retirement Plans - Assets of Plans Invested in Classes of Securities (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 29, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Elgin Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 100.00% |  |
Percentage of Plan Assets | 100.00% |  | 100.00%
Smithville Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 100.00% |  |
Percentage of Plan Assets | 100.00% |  | 100.00%
Wrexham Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 100.00% |  |
Percentage of Plan Assets |  | 100.00% | 100.00%
Equity [Member] | Elgin Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 48.00% |  |
Percentage of Plan Assets | 52.00% |  | 49.00%
Equity [Member] | Smithville Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 48.00% |  |
Percentage of Plan Assets | 52.00% |  | 51.00%
Equity [Member] | Wrexham Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 50.00% |  |
Percentage of Plan Assets | 71.00% |  | 66.00%
Fixed Income [Member] | Elgin Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 40.00% |  |
Percentage of Plan Assets | 36.00% |  | 37.00%
Fixed Income [Member] | Smithville Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 40.00% |  |
Percentage of Plan Assets | 37.00% |  | 37.00%
Fixed Income [Member] | Wrexham Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 50.00% |  |
Percentage of Plan Assets | 26.00% |  | 27.00%
Money Market [Member] | Elgin Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 4.00% |  |
Percentage of Plan Assets | 6.00% |  | 5.00%
Money Market [Member] | Smithville Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 4.00% |  |
Percentage of Plan Assets | 5.00% |  | 4.00%
Money Market [Member] | Wrexham Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 0.00% |  |
Percentage of Plan Assets | 3.00% |  | 7.00%
Other (real estate & commodities) [Member] | Elgin Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 8.00% |  |
Percentage of Plan Assets | 6.00% |  | 9.00%
Other (real estate & commodities) [Member] | Smithville Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 8.00% |  |
Percentage of Plan Assets | 6.00% |  | 8.00%
Other (real estate & commodities) [Member] | Wrexham Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target Allocation | 0.00% |  |
Percentage of Plan Assets | 0.00% |  | 0.00%

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -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. + Details
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