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Key Assumptions (Detail)	12 Months Ended
Key Assumptions (Detail)	Sep. 29, 2012	Oct. 01, 2011	Oct. 02, 2010
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Year 1 increase in cost of benefits	7.50%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)	4.50%
Pension Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	3.85%	4.75%	5.25%
Rate of return on plan assets	7.75%	7.75%	7.75%
Rate of salary increase	4.00%	4.00%	4.00%
Postretirement Medical Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate	3.85%	4.75%	5.25%
Rate of return on plan assets	7.75%	7.75%	7.75%
Year 1 increase in cost of benefits	7.50%	8.00%	8.25%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)	4.50%	4.50%	4.75%
Year that the rate reaches the ultimate trend rate	2026	2025	2022

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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- Definition

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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