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Retirement and Welfare Plans - Defined Benefit and Defined Contribution (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Apr. 25, 2015
Components of net periodic pension cost      
Other $ 51 $ 318 $ 124
Total retirement costs (excluding non-qualified defined benefit retirement plan) 12,702 14,363 11,536
401(k)      
Components of net periodic pension cost      
Defined contribution plan cost 7,124 6,657 6,270
PCRP      
Components of net periodic pension cost      
Defined contribution plan cost 1,488 3,088 1,377
Defined benefit pension plan for factory hourly employees      
Changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss (pre-tax)      
Beginning of year net actuarial loss 36,850 37,602  
Net current year actuarial (gain) loss 2,605 2,249  
Amortization of actuarial loss (3,058) (3,001)  
End of year net actuarial loss 36,397 36,850 37,602
Unrecognized actuarial losses expected to be amortized in fiscal 2018 3,100    
Components of net periodic pension cost      
Service cost 1,278 1,358 1,114
Interest cost 4,681 4,938 5,070
Expected return on plan assets (4,978) (4,997) (5,077)
Net amortization and deferral 3,058 3,001 2,658
Net periodic pension cost 4,039 4,300 3,765
Change in benefit obligation      
Benefit obligation at beginning of year 116,371 121,080  
Service cost 1,278 1,358 1,114
Interest cost 4,681 4,938 5,070
Actuarial loss 14 221  
Benefits paid (7,728) (10,808)  
Administrative expenses (431) (418)  
Benefit obligation at end of year 114,185 116,371 121,080
Change in plan assets      
Fair value of plan assets at beginning of year 112,484 113,742  
Actual return on plan assets 2,387 2,968  
Employer contributions 2,300 7,000  
Benefits paid (7,728) (10,808)  
Administrative expenses (431) (418)  
Fair value of plan assets at end of year 109,012 112,484 $ 113,742
Funded status (5,173) (3,887)  
Other long-term liabilities $ (5,173) $ (3,887)  
Actuarial assumptions for the defined benefit pension plan      
Discount rate used to determine benefit obligations (as a percent) 4.10% 4.10% 4.20%
Discount rate used to determine net benefit cost (as a percent) 4.10% 4.20% 4.40%
Long-term rate of return (as a percent) 4.50% 4.30% 4.70%
Pension assets      
Transfers from Level 1 to Level 2 assets $ 0 $ 0  
Transfers from Level 2 to Level 1 assets 0 0  
Expected contributions during fiscal 2018 2,000    
Expected benefit payments      
2018 6,458    
2019 6,593    
2020 6,720    
2021 6,836    
2022 6,949    
2023 to 2027 35,490    
Total 69,046    
Defined benefit pension plan for factory hourly employees | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year 22,744    
Fair value of plan assets at end of year 1,561 22,744  
Defined benefit pension plan for factory hourly employees | Level 2      
Change in plan assets      
Fair value of plan assets at beginning of year 89,740    
Fair value of plan assets at end of year $ 97,860 89,740  
Defined benefit pension plan for factory hourly employees | Fixed rate investments      
Pension assets      
Strategic asset allocation (as a percent) 90.00%    
Defined benefit pension plan for factory hourly employees | Cash and equivalents | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year $ 3,239    
Fair value of plan assets at end of year 44 3,239  
Defined benefit pension plan for factory hourly employees | Cash and equivalents | Level 2      
Change in plan assets      
Fair value of plan assets at beginning of year 15,440    
Fair value of plan assets at end of year 3,730 15,440  
Defined benefit pension plan for factory hourly employees | Equity funds | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year 19,505    
Fair value of plan assets at end of year 1,517 19,505  
Defined benefit pension plan for factory hourly employees | Equity funds | Level 2      
Change in plan assets      
Fair value of plan assets at beginning of year 42    
Fair value of plan assets at end of year 181 42  
Defined benefit pension plan for factory hourly employees | Debt funds | Level 2      
Change in plan assets      
Fair value of plan assets at beginning of year 74,258    
Fair value of plan assets at end of year 93,949 $ 74,258  
Defined benefit pension plan for factory hourly employees | Common trust funds, measured using net asset value      
Change in plan assets      
Fair value of plan assets at end of year $ 9,600