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Retirement and Welfare (Details) (USD $)
 1 Months Ended 12 Months Ended
Apr. 27, 2013
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation arrangement obligations $ 10,000,000 $ 10,000,000 $ 8,300,000  
Cash surrender value of life insurance contracts and mutual funds 10,000,000 10,000,000 8,300,000  
Defined benefit plan amounts recognized in other comprehensive income (loss) [Abstract]        
Beginning of year net actuarial loss   45,270,000 27,118,000  
Net current year actuarial loss   6,499,000 19,787,000  
Amortization of actuarial loss   (3,024,000) (1,635,000)  
End of year net actuarial loss 48,745,000 48,745,000 45,270,000  
Expect to amortize of unrecognized actuarial losses   3,400,000    
Actuarial assumptions defined benefit pension plan [Abstract]        
Strategic asset allocation (in hundredths)   5.00%    
Equity Securities [Member]
        
Actuarial assumptions defined benefit pension plan [Abstract]        
Strategic asset allocation (in hundredths)   65.00%    
Fixed Income [Member]
        
Actuarial assumptions defined benefit pension plan [Abstract]        
Strategic asset allocation (in hundredths)   35.00%    
Non-Qualified Defined Benefit Retirement Plan [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Non-qualified defined benefit retirement plan obligations 17,000,000 17,000,000 16,300,000  
Interest cost   800,000 800,000  
Actuarial loss recognized in accumulated other comprehensive loss   1,100,000 1,600,000  
Benefits paid   1,100,000 1,100,000  
Expected future benefit payments annually in next ten years 1,000,000 1,000,000    
Discount rate used to determine benefit obligations (in hundredths) 3.70% 3.70% 4.30%  
Components of net periodic benefit cost [Abstract]        
Interest cost   800,000 800,000  
Change in benefit obligation [Roll Forward]        
Interest cost   800,000 800,000  
Benefits paid   1,100,000 1,100,000  
Change in Plan Assets [Roll Forward]        
Benefits paid   1,100,000 1,100,000  
Defined Benefit Plan, amounts recognized in balance sheet [Abstract]        
Other long-term liabilities 17,000,000 17,000,000 16,300,000  
Actuarial assumptions defined benefit pension plan [Abstract]        
Discount rate used to determine benefit obligations (in hundredths) 3.70% 3.70% 4.30%  
Pension Plans [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Non-qualified defined benefit retirement plan obligations (12,065,000) (12,065,000) (29,345,000)  
Interest cost   5,325,000 5,565,000 5,531,000
Benefits paid   (9,586,000) (5,244,000)  
Discount rate used to determine benefit obligations (in hundredths) 4.00% 4.00% 4.60% 5.60%
Components of net periodic benefit cost [Abstract]        
Service cost   1,231,000 1,110,000 1,187,000
Interest cost   5,325,000 5,565,000 5,531,000
Expected return on plan assets   (6,855,000) (6,820,000) (6,027,000)
Net amortization and deferral   3,024,000 1,635,000 1,773,000
Net periodic pension cost (hourly plan)   2,725,000 1,490,000 2,464,000
401(k)   2,978,000 [1] 2,476,000 [1] 2,578,000 [1]
Profit sharing   2,278,000 [1] 0 [1] 0 [1]
Other   191,000 [1] 107,000 [1] 342,000 [1]
Total retirement costs (excluding non-qualified defined benefit retirement plan)   8,172,000 4,073,000 5,384,000
Change in benefit obligation [Roll Forward]        
Benefit obligation at beginning of year   118,347,000 101,602,000  
Service cost   1,231,000 1,110,000 1,187,000
Interest cost   5,325,000 5,565,000 5,531,000
Actuarial loss   8,178,000 15,314,000  
Benefits paid   (9,586,000) (5,244,000)  
Benefit obligation at end of year 123,495,000 123,495,000 118,347,000 101,602,000
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at beginning of year   89,002,000 86,100,000  
Actual return on plan assets   9,060,000 2,659,000  
Employer contributions 20,000,000 23,480,000 5,798,000  
Other expenses   (526,000) (311,000)  
Benefits paid   (9,586,000) (5,244,000)  
Fair value of plan assets at end of year 111,430,000 111,430,000 89,002,000 86,100,000
Funded status (12,065,000) (12,065,000) (29,345,000)  
Defined Benefit Plan, amounts recognized in balance sheet [Abstract]        
Other long-term liabilities (12,065,000) (12,065,000) (29,345,000)  
Actuarial assumptions defined benefit pension plan [Abstract]        
Discount rate used to determine benefit obligations (in hundredths) 4.00% 4.00% 4.60% 5.60%
Discount rate used to determine net benefit cost (in hundredths)   4.60% 5.60% 5.90%
Long-term rate of return (in hundredths)   6.30% 7.80% 8.00%
Employer contributions 20,000,000 23,480,000 5,798,000  
Defined Benefit Plan weighted average asset allocations [Abstract]        
Weighted average asset allocations (in hundredths) 100.00% 100.00% 100.00%  
Fair value of plan assets [Abstract]        
Fair value of plan assets 111,430,000 111,430,000 89,002,000 86,100,000
Employer discretionary contribution amount   20,000,000    
Defined Benefit Plan, Expected future benefit payments, fiscal year maturity [Abstract]        
2014 5,331,000 5,331,000    
2015 5,387,000 5,387,000    
2016 5,493,000 5,493,000    
2017 5,653,000 5,653,000    
2018 5,811,000 5,811,000    
2019 to 2024 32,014,000 32,014,000    
Total 59,689,000 59,689,000    
Pension Plans [Member] | Level 1 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 47,476,000 [2] 47,476,000 [2] 45,084,000 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 47,476,000 [2] 47,476,000 [2] 45,084,000 [3]  
Pension Plans [Member] | Level 2 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 63,954,000 [2] 63,954,000 [2] 43,918,000 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 63,954,000 [2] 63,954,000 [2] 43,918,000 [3]  
Pension Plans [Member] | Level 3 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 0 0 0  
Fair value of plan assets [Abstract]        
Fair value of plan assets 0 0 0  
Pension Plans [Member] | Equity Securities [Member]
        
Defined Benefit Plan weighted average asset allocations [Abstract]        
Weighted average asset allocations (in hundredths) 57.00% 57.00% 67.00%  
Pension Plans [Member] | Equity Securities [Member] | Level 1 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 47,047,000 [2] 47,047,000 [2] 44,725,000 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 47,047,000 [2] 47,047,000 [2] 44,725,000 [3]  
Pension Plans [Member] | Equity Securities [Member] | Level 2 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 16,140,000 [2] 16,140,000 [2] 15,071,000 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 16,140,000 [2] 16,140,000 [2] 15,071,000 [3]  
Pension Plans [Member] | Equity Securities [Member] | Level 3 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 0 0 0  
Fair value of plan assets [Abstract]        
Fair value of plan assets 0 0 0  
Pension Plans [Member] | Fixed Income [Member]
        
Defined Benefit Plan weighted average asset allocations [Abstract]        
Weighted average asset allocations (in hundredths) 29.00% 29.00% 31.00%  
Pension Plans [Member] | Cash and Equivalents [Member]
        
Defined Benefit Plan weighted average asset allocations [Abstract]        
Weighted average asset allocations (in hundredths) 14.00% 14.00% 2.00%  
Pension Plans [Member] | Cash and Equivalents [Member] | Level 1 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 429,000 [2] 429,000 [2] 359,000 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 429,000 [2] 429,000 [2] 359,000 [3]  
Pension Plans [Member] | Cash and Equivalents [Member] | Level 2 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 15,767,000 [2] 15,767,000 [2] 1,377,000 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 15,767,000 [2] 15,767,000 [2] 1,377,000 [3]  
Pension Plans [Member] | Cash and Equivalents [Member] | Level 3 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 0 0 0  
Fair value of plan assets [Abstract]        
Fair value of plan assets 0 0 0  
Pension Plans [Member] | Debt Securities [Member] | Level 1 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 0 [2] 0 [2] 0 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 0 [2] 0 [2] 0 [3]  
Pension Plans [Member] | Debt Securities [Member] | Level 2 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 32,047,000 [2] 32,047,000 [2] 27,470,000 [3]  
Fair value of plan assets [Abstract]        
Fair value of plan assets 32,047,000 [2] 32,047,000 [2] 27,470,000 [3]  
Pension Plans [Member] | Debt Securities [Member] | Level 3 [Member]
        
Change in Plan Assets [Roll Forward]        
Fair value of plan assets at end of year 0 0 0  
Fair value of plan assets [Abstract]        
Fair value of plan assets $ 0 $ 0 $ 0  
[1] Not determined by an actuary
[2] There were no transfers between Level 1 and Level 2 during fiscal 2013.
[3] There were no transfers between Level 1 and Level 2 during fiscal 2012.