Retirement Benefit Plans , Actuarial Assumptions and Plan Assets Target Allocations (Details)	12 Months Ended
	Apr. 24, 2015	Apr. 25, 2014	Apr. 26, 2013
U.S. Pension Benefits
Weighted average assumptions - projected benefit obligation:
Discount rate	4.20%	4.75%	4.55%
Rate of compensation increase	3.90%	3.90%	3.90%
Weighted average assumptions - net period benefit cost:
Discount rate	4.75%	4.55%	5.05%
Expected return on plan assets	8.25%	8.25%	8.25%
Rate of compensation increase	3.90%	3.90%	3.80%
Plan Assets Target Allocations
Target allocations	100.00%	100.00%
U.S. Pension Benefits | Equity Securities
Plan Assets Target Allocations
Target allocations	49.00%	50.00%
U.S. Pension Benefits | Debt Securities
Plan Assets Target Allocations
Target allocations	23.00%	20.00%
U.S. Pension Benefits | Other
Plan Assets Target Allocations
Target allocations	28.00%	30.00%
Non-U.S. Pension Benefits
Weighted average assumptions - projected benefit obligation:
Discount rate	1.88%	3.32%	3.52%
Rate of compensation increase	2.92%	2.80%	2.78%
Weighted average assumptions - net period benefit cost:
Discount rate	3.32%	3.52%	3.98%
Expected return on plan assets	4.77%	4.76%	5.19%
Rate of compensation increase	2.80%	2.78%	2.85%
Plan Assets Target Allocations
Target allocations	100.00%	100.00%
Non-U.S. Pension Benefits | Equity Securities
Plan Assets Target Allocations
Target allocations	35.00%	41.00%
Non-U.S. Pension Benefits | Debt Securities
Plan Assets Target Allocations
Target allocations	29.00%	22.00%
Non-U.S. Pension Benefits | Other
Plan Assets Target Allocations
Target allocations	36.00%	37.00%