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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 24, 2011
Sep. 25, 2010
Sep. 26, 2009
Components of net periodic benefit costs included in operating expenses [Abstract]   
Settlement charge$ 0$ 2,818$ 0
Assumptions used in calculating net periodic benefit costs [Abstract]   
Health care cost trend rate (in hundredths)7.74%  
Ultimate trend rate for health care costs (in hundredths)4.48%  
Percentage of sensitivity increase or decrease of assumed health care cost trend rates (in hundredths)1.00%  
Retirement Savings and Investment Plan 401(K) [Member]
   
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]   
Contributions to the 401(k) Plan1,2012,5045,676
Pension Benefits [Member]
   
Reconciliation of benefit obligations [Roll Forward]   
Benefit obligation at beginning of year157,626157,187 
Service cost000
Interest cost6,8227,5039,487
Actuarial loss9,1659,059 
Lump-sum payments paid(6,365)(7,889) 
Ordinary benefits paid(8,129)(8,234) 
Benefit obligation at end of year159,119157,626157,187
Reconciliation of fair value of plan assets [Roll Forward]   
Fair value of plan assets at beginning of year139,889140,055 
Actual return on plan assets7,50315,957 
Employer contributions00 
Lump-sum payments paid(6,365)(7,889) 
Ordinary benefits paid(8,129)(8,234) 
Fair value of plan assets at end of year132,898139,889140,055
Funded status [Abstract]   
Funded status at end of year(26,221)(17,737) 
Fair value of plan assets at end of year132,898139,889140,055
Amounts recognized in consolidated balance sheets consist of [Abstract]   
Net amount recognized at end of year(26,221)(17,737) 
Less: Current portion00 
Non-current benefit liability(26,221)(17,737) 
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss) [Abstract]   
Actuarial net (loss) gain(59,502)(56,267) 
Prior service credits00 
Net amount recognized in accumulated other comprehensive (loss) income(59,502)(56,267) 
Losses (gains) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year5,271  
Defined Benefit Plan Amounts Recognized in Other Comprehensive Income [Abstract]   
Amount recognized in other comprehensive income net of actuarial losses7,9571,181 
Plan Assets [Abstract]   
Number of members on the Benefits Committee5  
Actual allocation of assets held in trust [Abstract]   
Total (in hundredths)100.00%100.00% 
Projected Contributions and Benefit Payments by Fiscal Year [Abstract]   
201227,452  
201313,804  
201413,303  
201512,494  
201612,079  
2017 through 202151,118  
Components of net periodic benefit costs included in operating expenses [Abstract]   
Service cost000
Interest cost6,8227,5039,487
Expected return on plan assets(6,295)(8,080)(9,205)
Amortization of prior service credit000
Settlement charge02,8180
Recognized net actuarial loss4,7215,3744,050
Net periodic benefit costs5,2487,6154,332
Actuarial assumptions [Abstract]   
Weighted-average discount rate used in calculating benefit obligations (in hundredths)4.375%4.75% 
Assumptions used in calculating net periodic benefit costs [Abstract]   
Weighted-average discount rate (in hundredths)4.75%5.125%7.625%
Weighted-average expected long-term rate of return on plan assets (in hundredths)5.00%6.25%7.39%
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] | Equity securities [Member]
   
Target allocation of plan assets - equity securities [Abstract]   
Allocation percentage of plan assets - equity securities, range minimum (in hundredths)5.00%5.00% 
Allocation percentage of plan assets - equity securities, range maximum (in hundredths)25.00%25.00% 
Actual allocation of assets held in trust [Abstract]   
Equity securities (in hundredths)12.00%14.00% 
Pension Benefits [Member] | Short-term investments [Member] | Level 2 Inputs [Member]
   
Reconciliation of fair value of plan assets [Roll Forward]   
Fair value of plan assets at end of year1,439[1]1,259[1] 
Funded status [Abstract]   
Fair value of plan assets at end of year1,439[1]1,259[1] 
Pension Benefits [Member] | Domestic equity securities [Member] | Level 2 Inputs [Member]
   
Reconciliation of fair value of plan assets [Roll Forward]   
Fair value of plan assets at end of year10,823[1],[2]13,042[1],[2] 
Funded status [Abstract]   
Fair value of plan assets at end of year10,823[1],[2]13,042[1],[2] 
Pension Benefits [Member] | International equity securities [Member] | Level 2 Inputs [Member]
   
Reconciliation of fair value of plan assets [Roll Forward]   
Fair value of plan assets at end of year5,342[1],[2]6,563[1],[2] 
Funded status [Abstract]   
Fair value of plan assets at end of year5,342[1],[2]6,563[1],[2] 
Pension Benefits [Member] | Fixed income securities [Member]
   
Target allocation of plan assets - fixed income securities [Abstract]   
Allocation percentage of plan assets - fixed income securities, range minimum (in hundredths)75.00%75.00% 
Allocation percentage of plan assets - fixed income securities, range maximum (in hundredths)95.00%95.00% 
Actual allocation of assets held in trust [Abstract]   
Fixed income securities (in hundredths)88.00%86.00% 
Pension Benefits [Member] | Fixed income securities [Member] | Level 2 Inputs [Member]
   
Reconciliation of fair value of plan assets [Roll Forward]   
Fair value of plan assets at end of year115,294[1],[3]119,025[1],[3] 
Funded status [Abstract]   
Fair value of plan assets at end of year115,294[1],[3]119,025[1],[3] 
Pension Benefits [Member] | Level 2 Inputs [Member]
   
Reconciliation of fair value of plan assets [Roll Forward]   
Fair value of plan assets at end of year132,898139,889 
Funded status [Abstract]   
Fair value of plan assets at end of year132,898139,889 
Retiree Health and Life Benefits [Member]
   
Reconciliation of benefit obligations [Roll Forward]   
Benefit obligation at beginning of year20,93221,127 
Service cost774
Interest cost8551,0131,381
Actuarial loss631285 
Lump-sum payments paid00 
Ordinary benefits paid(1,530)(1,500) 
Benefit obligation at end of year20,89520,93221,127
Reconciliation of fair value of plan assets [Roll Forward]   
Fair value of plan assets at beginning of year00 
Actual return on plan assets00 
Employer contributions1,5301,500 
Lump-sum payments paid00 
Ordinary benefits paid(1,530)(1,500) 
Fair value of plan assets at end of year000
Funded status [Abstract]   
Funded status at end of year(20,895)(20,932) 
Fair value of plan assets at end of year000
Amounts recognized in consolidated balance sheets consist of [Abstract]   
Net amount recognized at end of year(20,895)(20,932) 
Less: Current portion1,6691,620 
Non-current benefit liability(19,226)(19,312) 
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss) [Abstract]   
Actuarial net (loss) gain1,8252,492 
Prior service credits2,3582,848 
Net amount recognized in accumulated other comprehensive (loss) income4,1835,340 
Losses (gains) in accumulated other comprehensive loss expected to be recognized as components of net period benefit costs in succeeding fiscal year(465)  
Defined Benefit Plan Amounts Recognized in Other Comprehensive Income [Abstract]   
Amount recognized in other comprehensive income net of actuarial losses631285 
Projected Contributions and Benefit Payments by Fiscal Year [Abstract]   
20121,669  
20131,603  
20141,540  
20151,466  
20161,382  
2017 through 20215,553  
Components of net periodic benefit costs included in operating expenses [Abstract]   
Service cost774
Interest cost8551,0131,381
Expected return on plan assets000
Amortization of prior service credit(490)(490)(490)
Settlement charge000
Recognized net actuarial loss(35)(65)(312)
Net periodic benefit costs$ 337$ 465$ 583
Actuarial assumptions [Abstract]   
Weighted-average discount rate used in calculating benefit obligations (in hundredths)4.00%4.25% 
Assumptions used in calculating net periodic benefit costs [Abstract]   
Weighted-average discount rate (in hundredths)4.25%5.00%7.625%
Health care cost trend (in hundredths)7.95%8.15%9.00%
[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 a diversified portfolio of publicly traded US and Non-US common stock.
[3]Includes funds which invest primarily in publicly traded and non-publicly traded, investment grade corporate bonds, U.S. government bonds and asset-back securities.