Retirement Plans - Changes in Pension Plan's Benefit Obligation and Fair Value of Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 29, 2013	Sep. 30, 2012	Sep. 25, 2011
Change in fair value of plan assets:
Employer contributions	$ 39,582	$ 38,801	$ 36,475
Pension Plan [Member]
Change in benefit obligation:
Beginning balance	122,413	100,182
Service cost	4,889	3,901	3,532
Interest cost	4,478	4,366	4,187
Actuarial (gain) loss	(19,113)	17,106
Benefit payments	(3,863)	(3,142)
Ending balance	108,804	122,413	100,182
Change in fair value of plan assets:
Beginning balance	78,306	61,887
Actual return on plan assets	6,305	7,144
Employer contributions	8,587	12,417
Benefit payments	(3,863)	(3,142)
Ending balance	89,335	78,306	61,887
Funded status:
Fair value of plan assets	89,335	78,306	61,887
Projected benefit obligation	108,804	122,413	100,182
Under funded	(19,469)	(44,107)
Medical Plan [Member]
Change in benefit obligation:
Beginning balance	2,235	2,077
Service cost	69	55
Interest cost	71	81
Actuarial (gain) loss	(179)	109
Benefit payments	(131)	(87)
Ending balance	2,065	2,235
Change in fair value of plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	131	87
Benefit payments	(131)	(87)
Ending balance	0	0
Funded status:
Fair value of plan assets	0	0
Projected benefit obligation	2,065	2,235
Under funded	$ (2,065)	$ (2,235)

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Defined Benefit Plan Actuarial Net Gains Losses Recognized

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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