Pension and Other Postretirement Benefit Plans 1 (Details) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 11 Months Ended 12 Months Ended
Jun. 07, 2013
Dec. 29, 2013
Apr. 28, 2013
Apr. 29, 2012
Apr. 27, 2011
Change in Plan Assets:          
Fair value of plan assets at the end of the year   $ 3,654,688 $ 3,379,143 $ 3,140,834  
Pension Plan, Defined Benefit [Member]
          
Change in Benefit Obligation:          
Benefit obligation at the beginning of the year 3,271,566 3,152,003 2,930,347 2,765,316  
Service cost 3,967 20,684 31,580 33,719 32,329
Interest cost 13,557 71,850 132,110 139,525 142,133
Participants’ contributions 186 1,298 2,294 2,281  
Amendments 0 0 (145) 3,396  
Actuarial (gain) loss (91,756) (72,118) 428,881 196,606  
Settlement 0 (113,075) (11,971) (1,854)  
Curtailment 0 (3,167) 0 0  
Special/contractual termination benefits 17,230 36,385      
Annuity plan transfers 0 81,144      
Benefits paid (13,191) (93,630) (157,672) (152,342)  
Translation adjustments (49,556) 144,018 (83,858) (56,300)  
Benefit obligation at the end of the year 3,152,003 3,225,392 3,271,566 2,930,347 2,765,316
Change in Plan Assets:          
Fair value of plan assets at the beginning of the year 3,379,143 3,334,138 3,140,834 3,261,881  
Actual return on plan assets 16,740 161,056 429,011 84,004  
Settlement 0 (113,075) (11,971) (1,854)  
Special/contractual termination benefits 0 (714)      
Employer contribution 6,812 156,165 69,388 23,469  
Participants’ contributions 186 1,298 2,294 2,281  
Annuity plan transfers 0 41,149      
Benefits paid (13,191) (93,630) (157,672) (152,342)  
Translation adjustments (55,552) 168,302 (92,741) (76,605)  
Fair value of plan assets at the end of the year 3,334,138 3,654,689 3,379,143 3,140,834 3,261,881
Funded status 182,135 429,297 107,577 210,487  
Other Postretirement Benefit Plans, Defined Benefit [Member]
          
Change in Benefit Obligation:          
Benefit obligation at the beginning of the year 257,317 250,633 249,017 234,431  
Service cost 743 3,550 6,486 5,967 6,311
Interest cost 938 5,053 9,923 11,457 12,712
Participants’ contributions 56 376 659 712  
Amendments 0 (20,603) 0 735  
Actuarial (gain) loss (6,038) (19,570) 9,153 17,278  
Settlement 0 0 0 0  
Curtailment 0 (1,017) 0 0  
Benefits paid (1,485) (8,372) (15,760) (19,574)  
Translation adjustments (898) (1,871) (2,161) (1,989)  
Benefit obligation at the end of the year 250,633 208,179 257,317 249,017 234,431
Change in Plan Assets:          
Fair value of plan assets at the beginning of the year 0 0 0 0  
Actual return on plan assets 0 0 0 0  
Settlement 0 0 0 0  
Employer contribution 1,429 7,996 15,101 18,862  
Participants’ contributions 56 376 659 712  
Benefits paid (1,485) (8,372) (15,760) (19,574)  
Translation adjustments 0   0 0  
Fair value of plan assets at the end of the year 0 0 0 0 0
Funded status $ (250,633) $ (208,179) $ (257,317) $ (249,017)