Retirement Benefit Plans, Actuarial Assumptions and Plan Assets Target Allocations (Details)	12 Months Ended
Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
U.S. Pension Benefits
Weighted average assumptions - projected benefit obligation:
Discount rate	5.05%	1.00%	6.05%
Rate of compensation increase	3.80%	3.80%	3.80%
Weighted average assumptions - net period benefit cost:
Discount rate	5.80%	6.05%	8.25%
Expected return on plan assets	8.25%	8.25%	8.25%
Rate of compensation increase	3.80%	3.80%	4.00%
Plan Assets Target Allocations
Target allocations	100.00%	100.00%
U.S. Pension Benefits \| Equity Securities
Plan Assets Target Allocations
Target allocations	50.00%	50.00%
U.S. Pension Benefits \| Debt Securities
Plan Assets Target Allocations
Target allocations	20.00%	20.00%
U.S. Pension Benefits \| Other
Plan Assets Target Allocations
Target allocations	30.00%	30.00%
Non-U.S. Pension Benefits
Weighted average assumptions - projected benefit obligation:
Discount rate	3.98%	4.75%	4.68%
Rate of compensation increase	2.85%	2.97%	3.05%
Weighted average assumptions - net period benefit cost:
Discount rate	4.75%	4.68%	5.41%
Expected return on plan assets	5.82%	5.71%	5.78%
Rate of compensation increase	2.97%	3.05%	2.90%
Plan Assets Target Allocations
Target allocations	100.00%	100.00%
Non-U.S. Pension Benefits \| Equity Securities
Plan Assets Target Allocations
Target allocations	41.00%	41.00%
Non-U.S. Pension Benefits \| Debt Securities
Plan Assets Target Allocations
Target allocations	23.00%	23.00%
Non-U.S. Pension Benefits \| Other
Plan Assets Target Allocations
Target allocations	36.00%	36.00%
Post-Retirement Benefits
Weighted average assumptions - projected benefit obligation:
Discount rate	5.05%	5.80%	6.05%
Initial health care cost trend rate pre-65	7.50%	7.75%	8.00%
Initial health care cost trend rate post-65	7.25%	7.50%	7.75%
Weighted average assumptions - net period benefit cost:
Discount rate	5.80%	6.05%	8.25%
Expected return on plan assets	8.25%	8.25%	8.25%
Initial health care cost trend rate pre-65	7.75%	8.00%	8.50%
Initial health care cost trend rate post-65	7.50%	7.75%	8.00%

The initial trend rate for health care costs post-65.

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- Definition

The initial trend rate for health care costs pre-65.

+ References

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- Definition

The initial trend rate for health care costs post-65.

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- Definition

The initial trend rate for health care costs pre-65.

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- Definition

2012 Element. Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

No definition available.

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: 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=6962843&loc=d3e1928-114920

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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ 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=6962843&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 264

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Expected Long-Term Rate of Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512013

-Topic 715

-SubTopic 30

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- Definition

Expected rate of compensation increases (for pay-related plans).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph j

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

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