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Employee Benefit Plans - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2017 USD ($) Member | Sep. 24, 2016 USD ($) | Sep. 26, 2015 USD ($) | Sep. 28, 2013 USD ($) Multiemployerpensionplan
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Pension settlement charge | $ 6,100,000 | $ 2,000,000 | $ 2,000,000 |
Lump sum pension settlement payments, includes benefits paid to employees participated in limited-time opportunity | $ 16,237,000 |  |  |
Lump sum pension settlement payments expiration date | 2017-08 |  |  |
Estimated obligation due to withdrawal multi employer pension plans | $ 23,665,000 | 24,205,000 |  | $ 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 |  | 6,600,000 | 11,300,000 |
Health and Welfare Benefits and Defined Annuity Plans [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Contributions | $ 1,089,000 | 1,446,000 | 1,817,000 |
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] | UNITED STATES |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
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] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Contributions for defined benefit pension plan | $ 11,523,000 | 715,000 | 0 |
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year | $ 3,683,000 |  |  |
Number of members on the Benefits Committee | Member | 6 |  |  |
Defined benefit plan expected future benefit payments | $ 10,290,000 |  |  |
Pension settlement payments to either terminated or retired individuals | 20,799,000 | 5,816,000 | 5,777,000 |
Settlement threshold amount | 4,164,000 | 5,041,000 | 5,128,000 |
Pension settlement charge | $ (6,100,000) | $ (2,000,000) | (2,000,000) |
Health care cost trend rate (in hundredths) | 0.00% | 0.00% |  |
Contributions | $ 467,000 | $ 748,000 | 1,073,000 |
Retiree Health and Life Benefits [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Contributions for defined benefit pension plan | 1,187,000 | 838,000 |  |
Expenses (credits) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year | (1,152,000) |  |  |
Pension settlement payments to either terminated or retired individuals | 0 | 0 |  |
Pension settlement charge | $ 0 | $ 0 | 0 |
Health care cost trend (in hundredths), twenty forty | 4.50% |  |  |
Health care cost trend rate (in hundredths) | 6.57% | 6.84% |  |
Percentage of sensitivity increase or decrease of assumed health care cost trend rates (in hundredths) | 1.00% |  |  |
Maximum [Member] | Pension Benefits [Member] | Fixed income securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Allocation percentage of plan assets (in hundredths) | 90.00% |  |  |
Maximum [Member] | Pension Benefits [Member] | Equity securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Allocation percentage of plan assets (in hundredths) | 20.00% |  |  |
Minimum [Member] | Pension Benefits [Member] | Fixed income securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Allocation percentage of plan assets (in hundredths) | 80.00% |  |  |
Minimum [Member] | Pension Benefits [Member] | Equity securities [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Allocation percentage of plan assets (in hundredths) | 10.00% |  |  |
Retiree Health and Life Benefits [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Employer contribution match amount | $ 0.50 |  |  |
Contribution costs to the 401(k) Plan | $ 4,041,000 | $ 1,477,000 | $ 1,844,000 |
Retiree Health and Life Benefits [Member] | Maximum [Member] |  |  |  |
Deferred Compensation Arrangement With Individual Postretirement Benefits [Line Items] |  |  |  |
Eligible compensation match percentage | 6.00% |  |  |

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