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Employee Benefit Plans - Additional Information (Details) | 12 Months Ended
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Sep. 26, 2015 USD ($) Member | Sep. 27, 2014 USD ($) | Sep. 28, 2013 USD ($) Multiemployerpensionplan
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Minimum funding requirements for defined benefit pension plan | $ 0 | $ 0 | $ 0
Defined benefit plan expected future benefit payments | 700,000 |  |
Pension settlement payments to either terminated or retired individuals | 5,777,000 |  |
Settlement threshold amount | 5,128,000 |  |
Pension settlement charge | $ 2,000,000 | 0 | 0
Health care cost trend | 4.50% |  |
Health care cost trend rate (in hundredths) | 7.10% |  |
Percentage of sensitivity increase or decrease of assumed health care cost trend rates (in hundredths) | 1.00% |  |
Estimated obligation due to withdrawal multi employer pension plans | $ 18,041,000 | 6,880,000 | $ 7,000,000
Number of voluntary partial withdrawal from multi employer pension plans | Multiemployerpensionplan |  |  | 1
Number of full withdrawal from multi employer pension plans | Multiemployerpensionplan |  |  | 4
Increase in estimated obligation due to withdrawal multi employer pension plans | 11,300,000 |  |
Contributions | 1,073,000 | 1,168,000 | $ 1,162,000
Health and Welfare Benefits and Defined Annuity Plans [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Contributions | $ 1,817,000 | 1,897,000 | $ 2,040,000
Red [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Multiemployer plans, funded status | Less than 65 percent |  |
Yellow [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Multiemployer plans, funded status | Between 65 and less than 80 percent |  |
Green [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Multiemployer plans, funded status | At least 80 percent |  |
Pension Benefits [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year | $ 5,218,000 |  |
Number of members on the Benefits Committee | Member | 6 |  |
Pension settlement payments to either terminated or retired individuals | $ 5,777,000 | $ 5,401,000 |
Pension settlement charge | $ (2,000,000) |  |
Percentage threshold of the greater of projected benefit obligation and market-related value plan assets as unrecognized actuarial gains and losses (in hundredths) | 10.00% |  |
Pension Benefits [Member] | Fixed income securities [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Allocation percentage of plan assets, range minimum (in hundredths) | 80.00% |  |
Allocation percentage of plan assets, range maximum (in hundredths) | 90.00% |  |
Pension Benefits [Member] | Equity securities [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Allocation percentage of plan assets, range minimum (in hundredths) | 10.00% |  |
Allocation percentage of plan assets, range maximum (in hundredths) | 20.00% |  |
Retiree Health and Life Benefits [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year | $ (698,000) |  |
Health care cost trend | 7.10% | 7.12% |
Health care cost trend rate (in hundredths) | 7.12% | 7.33% | 7.53%
Retirement Savings and Investment Plan 401(K) [Member] |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |
Contributions to the 401(k) Plan | $ 1,844,000 | $ 1,848,000 | $ 1,915,000

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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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