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Asset Allocation for Company-Sponsored Pension Plans and Target Allocations by Asset Category (Detail) (Pension Plans, Defined Benefit)	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010
Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Equity securities, target allocation for 2012	47.00%
Debt securities, target allocation for 2012	35.00%
Other, target allocation for 2012	18.00%
Total target allocation for 2012	100.00%
Equity securities	46.00%	42.00%
Debt securities	39.00%	44.00%
Other	15.00%	14.00%
Total	100.00%	100.00%

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Defined Benefit Plan Target Allocation Percentage, Total

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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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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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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 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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