Pension and Other Benefit Programs - Key Assumptions (Detail)	12 Months Ended
Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Pension Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate used to determine the benefit obligation	5.46%	5.06%	5.94%
Discount rate used to determine the interest cost component of net periodic benefit cost	4.81%	5.86%	5.37%
Rate of return on plan assets	7.25%	7.00%	7.00%
Weighted average rate of compensation increase to determine the benefit obligation	2.70%	2.70%	3.10%
Postretirement Medical Plans
Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]
Discount rate used to determine the benefit obligation	5.36%	5.00%	5.94%
Discount rate used to determine the interest cost component of net periodic benefit cost	4.73%	5.84%	5.38%
Rate of return on plan assets	7.25%	7.00%	7.00%
Year 1 increase in cost of benefits	7.50%	7.00%	7.00%
Rate of increase to which the cost of benefits is assumed to decline (the ultimate trend rate)	4.00%	4.00%	4.00%
Year that the rate reaches the ultimate trend rate	2044	2043	2042

Schedule of Net Periodic Benefit Costs Weighted Average Assumptions [Line Items]

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

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- Definition

Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (j)(2)
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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- Definition

Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Section 50
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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

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

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