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Schedule of Assumed Healthcare Cost Trend Rates for Post Retirement Benefit Plan (Detail)	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010
Defined Benefit Plan Disclosure [Line Items]
Current medical cost trend rate	9.90%	11.20%	10.50%
Ultimate medical cost trend rate	4.50%	4.50%	4.50%

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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