Pensions and Other Post-Retirement Benefits 10 (Details) (USD $)	12 Months Ended
Apr. 27, 2011	Apr. 28, 2010
Pensions and Other Post-Retirement Benefits (Textuals) [Abstract]
Projected benefit obligations of plan assets	$ 175,000,000	$ 160,900,000
Fair value of projected benefit obligations of plan assets	27,000,000	20,300,000
Accumulated benefit obligation for all defined benefit pension plans	2,602,000,000	2,414,300,000
Accumulated benefit obligations	154,300,000	137,000,000
Accumulated projected benefit obligations of plan assets	175,000,000	160,900,000
Fair value of accumulated projected benefit obligations of plan assets	27,000,000	20,300,000
Employer contribution	22,400,000
Discretionary contributions by employer	0
Pension Benefits [Member]
Pensions and Other Post-Retirement Benefits (Textuals) [Abstract]
Other comprehensive gains/(losses) defined benefit plans	95,500,000	106,600,000
Reclassification of other comprehensive gains/(losses) defined benefit plans	82,200,000	60,600,000
Other asset category include cash	11.00%
Employer contribution	22,411,000	539,939,000
Expected contributions in defined benefit plans in next fiscal year	40,000,000
Other Retiree Benefits [Member]
Pensions and Other Post-Retirement Benefits (Textuals) [Abstract]
Other comprehensive gains/(losses) defined benefit plans	7,500,000	11,400,000
Reclassification of other comprehensive gains/(losses) defined benefit plans	3,600,000	3,200,000
Weighted-average assumed annual composite rate of increase in the per capita cost of company-provided health care benefits	7.40%
Weighted-average assumed annual composite rate of gradually decreases by 2018 and remains at that level thereafte in the per capita cost of company-provided health care benefits	4.80%
Year that rate reaches ultimate trend rate	2018
Employer contribution	16,164,000	17,490,000
Expected contributions in defined benefit plans in next fiscal year	18,000,000
Received medical subsidies	1,400,000
Estimated future medical subsidy receipts in 2012	300,000
Estimated future medical subsidy receipts in 2013	300,000
Estimated future medical subsidy receipts in 2014	400,000
Estimated future medical subsidy receipts in 2015	400,000
Estimated future medical subsidy receipts in 2016	400,000
Estimated future medical subsidy receipts in 2017 and through 2021	2,500,000
PPACA reduction in tax benefits of Mediace Part D subsidy		$ 3,900,000
PPACA reduction in tax benefits of Mediace Part D subsidy, per share		$ 0.01

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Defined Benefit Plan Discretionary Contributions By Employer.

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Pensions and Other Post Retirement Benefits Textuals Abstract.

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PPACA Reductionin tax benefits of Medicare Part D Subsidy.

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PPACA Reductionin tax benefits of Medicare Part D Subsidy Per share.

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Prescription Drug Subsidy Receipts Current Year

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- Definition

For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

+ 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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The amount of contributions made by the employer.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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The ultimate trend rate for health care costs.

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The year when the ultimate health care cost trend rate is expected to be reached.

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Pretax change in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan, that has not been recognized in net periodic benefit cost.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 17, 19, 24

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-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(3)

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The net gain or loss previously recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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- Definition

Aggregate amount for the next five fiscal years following the first five fiscal years (that is the aggregate of fiscal years six through ten) following the balance sheet date of the prescription drug subsidy receipts expected to be received.

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Amount of the prescription drug subsidy receipts expected to be received in Year 5 after the balance sheet date.

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Amount of the prescription drug subsidy receipts expected to be received in Year 4 after the balance sheet date.

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Amount of the prescription drug subsidy receipts expected to be received in Year 1 after the balance sheet date.

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Amount of the prescription drug subsidy receipts expected to be received in Year 3 after the balance sheet date.

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Amount of the prescription drug subsidy receipts expected to be received in Year 2 after the balance sheet date.

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