Assets of Plans Invested in Classes of Securities (Detail)	12 Months Ended
Dec. 31, 2011	Jan. 01, 2011
Elgin Plan
Target Allocation
Equity	48.00%
Fixed income	40.00%
Money market	4.00%
Other (real estate & commodities)	8.00%
Defined Benefit Plan, Assets Target Allocations, Total, Total	100.00%
Percentage of Plan Assets
Equity	49.00%	48.00%
Fixed income	37.00%	32.00%
Money market	5.00%	12.00%
Other (real estate & commodities)	9.00%	8.00%
Defined Benefit Plan, Actual Plan Asset Allocations, Total	100.00%	100.00%
Smithville Plan
Target Allocation
Equity	48.00%
Fixed income	40.00%
Money market	4.00%
Other (real estate & commodities)	8.00%
Defined Benefit Plan, Assets Target Allocations, Total, Total	100.00%
Percentage of Plan Assets
Equity	51.00%	56.00%
Fixed income	37.00%	36.00%
Money market	4.00%
Other (real estate & commodities)	8.00%	8.00%
Defined Benefit Plan, Actual Plan Asset Allocations, Total	100.00%	100.00%
Wrexham Plan
Target Allocation
Equity	50.00%
Fixed income	50.00%
Defined Benefit Plan, Assets Target Allocations, Total, Total	100.00%
Percentage of Plan Assets
Equity	66.00%
Fixed income	27.00%
Money market	7.00%
Defined Benefit Plan, Actual Plan Asset Allocations, Total	100.00%

Defined Benefit Plan, Assets Target Allocations, Total

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Defined Benefit Plan, Money Market

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The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date.

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-Name Statement of Financial Accounting Standard (FAS)

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The percentage of the fair value of equity securities to the fair value of total plan assets held as of the measurement date.

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The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date.

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Target allocation percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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Target allocation percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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The aggregate percentage of the fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of total plan assets held as of the measurement date.

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