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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 27, 2014
Member
Sep. 28, 2013
Sep. 29, 2012
Actuarial assumptions [Abstract]      
Health care cost trend (in hundredths) 4.48%    
Assumptions used in calculating benefit cost [Abstract]      
Health care cost trend rate (in hundredths) 7.12%    
Percentage of sensitivity increase or decrease of assumed health care cost trend rates (in hundredths) 1.00%    
Pension Benefits [Member]
     
Reconciliation of benefit obligations [Roll Forward]      
Benefit obligation at beginning of year $ 148,631 $ 165,906  
Service cost 0 0 0
Interest cost 5,774 5,229 6,311
Actuarial loss (gain) 8,459 (11,446)  
Lump-sum benefits paid (5,401) (3,155)  
Ordinary benefits paid (7,627) (7,903)  
Benefit obligation at end of year 149,836 148,631 165,906
Fair value of plan assets [Abstract]      
Fair value of plan assets at beginning of year 120,776 133,873  
Actual return on plan assets 10,023 (2,039)  
Employer contributions 0 0  
Lump-sum benefits paid (5,401) (3,155)  
Ordinary benefits paid (7,627) (7,903)  
Fair value of plan assets at end of year 117,771 120,776 133,873
Funded status [Abstract]      
Funded status at end of year (32,065) (27,855)  
Amounts recognized in consolidated balance sheets consist of [Abstract]      
Net amount recognized at end of year (32,065) (27,855)  
Less: Current portion 0 0  
Non-current benefit liability (32,065) (27,855)  
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss) [Abstract]      
Actuarial net (loss) gain (49,034) (49,986)  
Prior service credits 0 0  
Net amount recognized in accumulated other comprehensive (loss) income (49,034) (49,986)  
Losses (gains) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year 4,522    
Defined Benefit Plan Amounts Recognized in Other Comprehensive Income [Abstract]      
Amount recognized in other comprehensive income net of actuarial losses (gains) 3,538 (4,126)  
Plan Assets [Abstract]      
Number of members on the Benefits Committee 6    
Actual allocation of assets held in trust [Abstract]      
Percentage allocation of plan assets (in hundredths) 100.00% 100.00%  
Projected Contributions and Benefit Payments by Fiscal Year [Abstract]      
2015 32,316    
2016 12,632    
2017 11,194    
2018 11,317    
2019 10,244    
2020 through 2024 45,032    
Components of net periodic benefit costs included in operating expenses [Abstract]      
Service cost 0 0 0
Interest cost 5,774 5,229 6,311
Expected return on plan assets (5,102) (5,281) (5,665)
Amortization of prior service credit 0 0 0
Recognized net actuarial loss 4,492 5,285 5,271
Net periodic benefit costs 5,164 5,233 5,917
Actuarial assumptions [Abstract]      
Weighted-average discount rate used in calculating benefit obligations (in hundredths) 3.875% 4.375%  
Assumptions used in calculating benefit cost [Abstract]      
Weighted-average discount rate (in hundredths) 4.375% 3.50% 4.375%
Weighted-average expected long-term rate of return on plan assets (in hundredths) 4.90% 4.50% 4.80%
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]
     
Target allocation of plan assets [Abstract]      
Allocation percentage of plan assets, range minimum (in hundredths) 80.00%    
Allocation percentage of plan assets, range maximum (in hundredths) 90.00%    
Actual allocation of assets held in trust [Abstract]      
Percentage allocation of plan assets (in hundredths) 85.00% 85.00%  
Pension Benefits [Member] | Equity securities [Member]
     
Target allocation of plan assets [Abstract]      
Allocation percentage of plan assets, range minimum (in hundredths) 10.00%    
Allocation percentage of plan assets, range maximum (in hundredths) 20.00%    
Actual allocation of assets held in trust [Abstract]      
Percentage allocation of plan assets (in hundredths) 15.00% 15.00%  
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member]
     
Fair value of plan assets [Abstract]      
Fair value of plan assets at end of year 117,771 120,776  
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed income securities [Member]
     
Fair value of plan assets [Abstract]      
Fair value of plan assets at end of year 98,985 [1],[2] 101,521 [1],[2]  
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term investments [Member]
     
Fair value of plan assets [Abstract]      
Fair value of plan assets at end of year 1,500 [1] 1,516 [1]  
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | Domestic equity securities [Member]
     
Fair value of plan assets [Abstract]      
Fair value of plan assets at end of year 6,370 [1],[3] 11,780 [1],[3]  
Pension Benefits [Member] | Fair Value, Inputs, Level 2 [Member] | International equity securities [Member]
     
Fair value of plan assets [Abstract]      
Fair value of plan assets at end of year 10,916 [1],[3] 5,959 [1],[3]  
Retiree Health and Life Benefits [Member]
     
Reconciliation of benefit obligations [Roll Forward]      
Benefit obligation at beginning of year 17,754 20,232  
Service cost 5 8 7
Interest cost 640 586 802
Actuarial loss (gain) (278) (1,784)  
Lump-sum benefits paid 0 0  
Ordinary benefits paid (1,167) (1,288)  
Benefit obligation at end of year 16,954 17,754 20,232
Fair value of plan assets [Abstract]      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 1,167 1,288  
Lump-sum benefits paid 0 0  
Ordinary benefits paid (1,167) (1,288)  
Fair value of plan assets at end of year 0 0 0
Funded status [Abstract]      
Funded status at end of year (16,954) (17,754)  
Amounts recognized in consolidated balance sheets consist of [Abstract]      
Net amount recognized at end of year (16,954) (17,754)  
Less: Current portion 1,276 1,427  
Non-current benefit liability (15,678) (16,327)  
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss) [Abstract]      
Actuarial net (loss) gain 3,780 3,683  
Prior service credits 889 1,379  
Net amount recognized in accumulated other comprehensive (loss) income 4,669 5,062  
Losses (gains) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year (686)    
Defined Benefit Plan Amounts Recognized in Other Comprehensive Income [Abstract]      
Amount recognized in other comprehensive income net of actuarial losses (gains) (278) (1,784)  
Projected Contributions and Benefit Payments by Fiscal Year [Abstract]      
2015 1,276    
2016 1,202    
2017 1,122    
2018 1,048    
2019 972    
2020 through 2024 3,599    
Components of net periodic benefit costs included in operating expenses [Abstract]      
Service cost 5 8 7
Interest cost 640 586 802
Expected return on plan assets 0 0 0
Amortization of prior service credit (490) (490) (490)
Recognized net actuarial loss (181) 0 0
Net periodic benefit costs (26) 104 319
Actuarial assumptions [Abstract]      
Weighted-average discount rate used in calculating benefit obligations (in hundredths) 3.50% 3.75%  
Health care cost trend (in hundredths) 7.12% 7.33%  
Assumptions used in calculating benefit cost [Abstract]      
Weighted-average discount rate (in hundredths) 3.75% 3.00% 4.00%
Health care cost trend (in hundredths) 7.33% 7.53% 7.74%
Retirement Savings and Investment Plan 401(K) [Member]
     
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Contributions to the 401(k) Plan $ 1,848 $ 1,915 $ 1,359
[1] Includes funds which are not publicly traded and are valued at the net asset value of the units provided by the fund issuer.
[2] Includes funds which invest primarily in publicly traded and non-publicly traded, investment grade corporate bonds, U.S. government bonds and asset-backed securities.
[3] Includes funds which invest primarily in a diversified portfolio of publicly traded US and Non-US common stock.