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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 28, 2013
Member
Sep. 29, 2012
Sep. 24, 2011
Actuarial assumptions [Abstract]      
Health care cost trend (in hundredths) 4.48%    
Assumptions used in calculating benefit obligation [Abstract]      
Health care cost trend rate (in hundredths) 7.33%    
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 $ 165,906 $ 159,119  
Service cost 0 0 0
Interest cost 5,229 6,311 6,822
Actuarial loss (gain) (11,446) 14,089  
Lump-sum payments paid (3,155) (5,498)  
Ordinary benefits paid (7,903) (8,115)  
Benefit obligation at end of year 148,631 165,906 159,119
Fair value of plan assets [Abstract]      
Fair value of plan assets at beginning of year 133,873 132,898  
Actual return on plan assets (2,039) 14,588  
Employer contributions 0 0  
Lump-sum payments paid (3,155) (5,498)  
Ordinary benefits paid (7,903) (8,115)  
Fair value of plan assets at end of year 120,776 133,873 132,898
Funded status [Abstract]      
Funded status at end of year (27,855) (32,033)  
Amounts recognized in consolidated balance sheets consist of [Abstract]      
Net amount recognized at end of year (27,855) (32,033)  
Less: Current portion 0 0  
Non-current benefit liability (27,855) (32,033)  
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss) [Abstract]      
Actuarial net (loss) gain (49,986) (59,397)  
Prior service credits 0 0  
Net amount recognized in accumulated other comprehensive (loss) income (49,986) (59,397)  
Losses (gains) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year 4,492    
Defined Benefit Plan Amounts Recognized in Other Comprehensive Income [Abstract]      
Amount recognized in other comprehensive income net of actuarial losses (4,126) 5,166  
Plan Assets [Abstract]      
Number of members on the Benefits Committee 5    
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]      
2014 30,745    
2015 12,968    
2016 12,474    
2017 11,033    
2018 10,923    
2019 through 2023 46,319    
Components of net periodic benefit costs included in operating expenses [Abstract]      
Service cost 0 0 0
Interest cost 5,229 6,311 6,822
Expected return on plan assets (5,281) (5,665) (6,295)
Amortization of prior service credit 0 0 0
Recognized net actuarial loss 5,285 5,271 4,721
Net periodic benefit costs 5,233 5,917 5,248
Actuarial assumptions [Abstract]      
Weighted-average discount rate used in calculating benefit obligations (in hundredths) 4.375% 3.50%  
Assumptions used in calculating benefit obligation [Abstract]      
Weighted-average discount rate (in hundredths) 3.50% 4.375% 4.75%
Weighted-average expected long-term rate of return on plan assets (in hundredths) 4.50% 4.80% 5.00%
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 120,776 133,873  
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 101,521 [1],[2] 112,650 [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 1,516 [1] 1,309 [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 11,780 [1],[3] 13,187 [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 5,959 [1],[3] 6,727 [1],[3]  
Retiree Health and Life Benefits [Member]
     
Reconciliation of benefit obligations [Roll Forward]      
Benefit obligation at beginning of year 20,232 20,895  
Service cost 8 7 7
Interest cost 586 802 855
Actuarial loss (gain) (1,784) (74)  
Lump-sum payments paid 0 0  
Ordinary benefits paid (1,288) (1,398)  
Benefit obligation at end of year 17,754 20,232 20,895
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 1,288 1,398  
Lump-sum payments paid 0 0  
Ordinary benefits paid (1,288) (1,398)  
Fair value of plan assets at end of year 0 0 0
Funded status [Abstract]      
Funded status at end of year (17,754) (20,232)  
Amounts recognized in consolidated balance sheets consist of [Abstract]      
Net amount recognized at end of year (17,754) (20,232)  
Less: Current portion 1,427 1,427  
Non-current benefit liability (16,327) (18,805)  
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss) [Abstract]      
Actuarial net (loss) gain 3,683 1,899  
Prior service credits 1,379 1,869  
Net amount recognized in accumulated other comprehensive (loss) income 5,062 3,768  
Losses (gains) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year (671)    
Defined Benefit Plan Amounts Recognized in Other Comprehensive Income [Abstract]      
Amount recognized in other comprehensive income net of actuarial losses (1,784) (74)  
Projected Contributions and Benefit Payments by Fiscal Year [Abstract]      
2014 1,337    
2015 1,270    
2016 1,194    
2017 1,111    
2018 1,036    
2019 through 2023 3,935    
Components of net periodic benefit costs included in operating expenses [Abstract]      
Service cost 8 7 7
Interest cost 586 802 855
Expected return on plan assets 0 0 0
Amortization of prior service credit (490) (490) (490)
Recognized net actuarial loss 0 0 (35)
Net periodic benefit costs 104 319 337
Actuarial assumptions [Abstract]      
Weighted-average discount rate used in calculating benefit obligations (in hundredths) 3.75% 3.00%  
Health care cost trend (in hundredths) 7.33% 7.53%  
Assumptions used in calculating benefit obligation [Abstract]      
Weighted-average discount rate (in hundredths) 3.00% 4.00% 4.25%
Health care cost trend (in hundredths) 7.53% 7.74% 7.95%
Retirement Savings and Investment Plan 401(K) [Member]
     
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Contributions to the 401(k) Plan $ 1,915 $ 1,359 $ 1,201
[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.