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Weighted Average Assumptions Used for Pension Plans (Detail)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011		Jan. 01, 2011
Defined Benefit Plan Disclosure [Line Items]
Weighted average assumptions used to determine net periodic cost, Expected return on plan assets	8.00%
Net Periodic Pension Cost
Defined Benefit Plan Disclosure [Line Items]
Weighted average assumptions used to determine net periodic cost, Discount rate	4.70%	5.38%	[1]	5.98%
Weighted average assumptions used to determine benefit obligations, Discount rate	4.00%	4.70%		5.48%
Weighted average assumptions used to determine benefit obligations, Rate of compensation increase	4.00%	4.00%		3.50%
Weighted average assumptions used to determine net periodic cost, Expected return on plan assets	8.00%	8.00%		8.00%
Weighted average assumptions used to determine net periodic cost, Rate of compensation increase	4.00%	3.50%		3.50%
Net Periodic Pension Cost | Benefit Obligations
Defined Benefit Plan Disclosure [Line Items]
Weighted average assumptions used to determine Measurement date	12/31/2012	12/31/2011		12/31/2010
Net Periodic Pension Cost | net (income) cost
Defined Benefit Plan Disclosure [Line Items]
Weighted average assumptions used to determine Measurement date	1/1/2012	1/1/2011		1/1/2010
Net Periodic Postretirement Benefit Cost | Benefit Obligations
Defined Benefit Plan Disclosure [Line Items]
Weighted average assumptions used to determine benefit obligations, Measurement date	12/31/2012	12/31/2011		12/31/2010
Weighted average assumptions used to determine benefit obligations, Discount rate	3.34%	4.35%		5.00%
Health care cost trend rate, Initial rate	8.00%	8.50%		8.00%
Health care cost trend rate, Ultimate rate	5.00%	5.00%		5.00%
Health care cost trend rate, Year trend reaches the ultimate rate	2019	2019		2017
Net Periodic Postretirement Benefit Cost | Net Periodic Benefit Cost
Defined Benefit Plan Disclosure [Line Items]
Weighted average assumptions used to determine net periodic cost, Measurement date	1/1/2012	1/1/2011		1/1/2010
Weighted average assumptions used to determine net periodic cost, Discount rate	4.35%	5.00%		5.75%
Health care cost trend rate, Initial rate	8.50%	8.00%		8.00%
Health care cost trend rate, Ultimate rate	5.00%	5.00%		5.00%
Health care cost trend rate, Year trend reaches the ultimate rate	2019	2017		2016
[1] The Tasty pension plans were acquired May 20, 2011. The weighted average discount rate used to determine net (income) cost for these plans was 4.98%.

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Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Measurement Date

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Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Measurement Date

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- Definition

The interest rate used to adjust for the time value of money for the plan.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Expected rate of compensation increases (for pay-related plans).

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The date(s) used to measure (at least the majority of) plan assets and benefit obligations for defined benefit pension and other postretirement benefit plans. Disclosure required by FAS 132R paragraph 5k prior to being amended by FAS 158.

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The ultimate trend rate for health care costs.

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Year the ultimate health care cost trend rate is expected to be reached, in CCYY format.

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