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Retirement Benefit Plans - Actuarial Assumptions and Plan Assets Target Allocations (Details) - Pension benefits | 12 Months Ended
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Apr. 24, 2020 | Apr. 26, 2019 | Apr. 27, 2018
U.S. Pension Benefits |  |  |
Critical assumptions – projected benefit obligation: |  |  |
Rate of compensation increase | 3.90% | 3.90% | 3.90%
Critical assumptions – net periodic benefit cost: |  |  |
Expected return on plan assets | 7.90% | 7.90% | 7.90%
Rate of compensation increase | 3.90% | 3.90% | 3.90%
Plan Assets Target Allocations |  |  |
Target Allocation | 100.00% |  |
Actual Allocation | 100.00% | 100.00% |
U.S. Pension Benefits | Equity securities |  |  |
Plan Assets Target Allocations |  |  |
Target Allocation | 49.00% |  |
Actual Allocation | 39.00% | 50.00% |
U.S. Pension Benefits | Debt securities |  |  |
Plan Assets Target Allocations |  |  |
Target Allocation | 32.00% |  |
Actual Allocation | 27.00% | 34.00% |
U.S. Pension Benefits | Other |  |  |
Plan Assets Target Allocations |  |  |
Target Allocation | 19.00% |  |
Actual Allocation | 34.00% | 16.00% |
U.S. Pension Benefits | Minimum |  |  |
Critical assumptions – projected benefit obligation: |  |  |
Discount rate | 3.10% | 3.90% | 4.20%
Critical assumptions – net periodic benefit cost: |  |  |
Discount rate – benefit obligation | 3.90% | 4.20% | 4.00%
Discount rate – service cost | 3.70% | 4.10% | 3.70%
Discount rate – interest cost | 3.50% | 4.00% | 3.45%
U.S. Pension Benefits | Maximum |  |  |
Critical assumptions – projected benefit obligation: |  |  |
Discount rate | 3.70% | 4.20% | 4.35%
Critical assumptions – net periodic benefit cost: |  |  |
Discount rate – benefit obligation | 4.30% | 4.30% | 4.30%
Discount rate – service cost | 4.00% | 4.40% | 4.45%
Discount rate – interest cost | 4.30% | 4.10% | 3.80%
Non-U.S. Pension Benefits |  |  |
Critical assumptions – projected benefit obligation: |  |  |
Rate of compensation increase | 2.91% | 2.87% | 2.88%
Critical assumptions – net periodic benefit cost: |  |  |
Expected return on plan assets | 4.19% | 4.23% | 4.20%
Rate of compensation increase | 2.87% | 2.88% | 2.89%
Non-U.S. Pension Benefits | Equity securities |  |  |
Plan Assets Target Allocations |  |  |
Target Allocation | 37.00% |  |
Non-U.S. Pension Benefits | Debt securities |  |  |
Plan Assets Target Allocations |  |  |
Target Allocation | 30.00% |  |
Non-U.S. Pension Benefits | Other |  |  |
Plan Assets Target Allocations |  |  |
Target Allocation | 33.00% |  |
Non-U.S. Pension Benefits | Minimum |  |  |
Critical assumptions – projected benefit obligation: |  |  |
Discount rate | 0.30% | 0.40% | 0.70%
Critical assumptions – net periodic benefit cost: |  |  |
Discount rate – benefit obligation | 0.40% | 0.50% | 0.45%
Discount rate – service cost | 0.40% | 0.50% | 0.20%
Discount rate – interest cost | 0.40% | 0.50% | 0.45%
Non-U.S. Pension Benefits | Maximum |  |  |
Critical assumptions – projected benefit obligation: |  |  |
Discount rate | 13.30% | 13.90% | 11.00%
Critical assumptions – net periodic benefit cost: |  |  |
Discount rate – benefit obligation | 13.90% | 11.00% | 11.40%
Discount rate – service cost | 13.90% | 11.00% | 11.40%
Discount rate – interest cost | 13.90% | 11.00% | 11.40%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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