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Retirement Benefit Plans , Actuarial Assumptions and Plan Assets Target Allocations (Details) | 12 Months Ended
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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% |  |

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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Interest Cost, Discount Rate + References No definition available. + Details
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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Service Cost, Discount Rate + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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