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Retirement Benefit Plans , Actuarial Assumptions and Plan Assets Target Allocations (Details)
 12 Months Ended
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
U.S. Pension Benefits      
Plan Assets Target Allocations      
Target allocations 100.00%    
Actual Allocation 100.00% 100.00%  
U.S. Pension Benefits | Equity      
Plan Assets Target Allocations      
Target allocations 40.00%    
Actual Allocation 45.00% 43.00%  
U.S. Pension Benefits | Debt securities      
Plan Assets Target Allocations      
Target allocations 36.00%    
Actual Allocation 37.00% 35.00%  
U.S. Pension Benefits | Other      
Plan Assets Target Allocations      
Target allocations 24.00%    
Actual Allocation 18.00% 22.00%  
Pension benefits | U.S. Pension Benefits      
Critical assumptions – projected benefit obligation:      
Discount rate     4.20%
Rate of compensation increase 3.90% 3.90% 3.90%
Critical assumptions – net periodic benefit cost:      
Discount rate – benefit obligation     4.75%
Discount rate – service cost     4.75%
Discount rate – interest cost     4.75%
Expected return on plan assets 8.20% 8.20% 8.25%
Rate of compensation increase 3.90% 3.90% 3.90%
Pension benefits | U.S. Pension Benefits | Minimum      
Critical assumptions – projected benefit obligation:      
Discount rate 3.70% 3.60%  
Critical assumptions – net periodic benefit cost:      
Discount rate – benefit obligation 3.55% 4.20%  
Discount rate – service cost 3.60% 4.20%  
Discount rate – interest cost 2.90% 4.20%  
Pension benefits | U.S. Pension Benefits | Maximum      
Critical assumptions – projected benefit obligation:      
Discount rate 4.30% 4.30%  
Critical assumptions – net periodic benefit cost:      
Discount rate – benefit obligation 4.30% 4.80%  
Discount rate – service cost 4.45% 4.80%  
Discount rate – interest cost 3.80% 4.80%  
Pension benefits | Non-U.S. Pension Benefits      
Critical assumptions – projected benefit obligation:      
Discount rate     1.88%
Rate of compensation increase 2.89% 2.83% 2.92%
Critical assumptions – net periodic benefit cost:      
Discount rate – benefit obligation     3.32%
Discount rate – service cost     3.32%
Discount rate – interest cost     3.32%
Expected return on plan assets 4.45% 4.35% 4.77%
Rate of compensation increase 2.83% 2.92% 2.80%
Pension benefits | Non-U.S. Pension Benefits | Minimum      
Critical assumptions – projected benefit obligation:      
Discount rate 0.45% 0.25%  
Critical assumptions – net periodic benefit cost:      
Discount rate – benefit obligation 0.25% 0.80%  
Discount rate – service cost 0.05% 0.80%  
Discount rate – interest cost 0.30% 0.80%  
Pension benefits | Non-U.S. Pension Benefits | Maximum      
Critical assumptions – projected benefit obligation:      
Discount rate 11.40% 10.20%  
Critical assumptions – net periodic benefit cost:      
Discount rate – benefit obligation 10.20% 9.00%  
Discount rate – service cost 10.20% 9.00%  
Discount rate – interest cost 10.20% 9.00%  
Pension benefits | Non-U.S. Pension Benefits | Equity      
Plan Assets Target Allocations      
Target allocations 37.00%    
Pension benefits | Non-U.S. Pension Benefits | Debt securities      
Plan Assets Target Allocations      
Target allocations 29.00%    
Pension benefits | Non-U.S. Pension Benefits | Other      
Plan Assets Target Allocations      
Target allocations 34.00%