Income Tax 4 (Details) (USD $) In Thousands	Apr. 27, 2011	Apr. 28, 2010
Components of Deferred Tax Assets and Liabilities [Abstract]
Depreciation/amortization	$ 939,545	$ 754,353
Benefit plans	93,916	38,718
Deferred income	126,917	66,920
Financing costs	118,118	118,512
Other	48,839	102,663
Deferred tax liabilities	1,327,335	1,081,166
Operating loss carryforwards and carrybacks	(120,261)	(159,519)
Benefit plans	(168,001)	(178,363)
Depreciation/amortization	(108,873)	(74,925)
Tax credit carryforwards	(41,850)	(62,284)
Deferred income	(24,235)	(36,373)
Other	(109,929)	(123,681)
Deferred tax assets	(573,149)	(635,145)
Valuation allowance	64,386	62,519
Net deferred tax liabilities	$ 818,572	$ 508,540

Deferred Tax Assets, Benefit Plans.

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Deferred Tax Assets, Depreciation/Amortization.

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Deferred Tax Assets, Operating Loss Carryforwards and Carrybacks.

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Deferred Tax Liabilities, Benefit Plans.

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Deferred Tax Liabilities, Depreciation/Amortization.

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Deferred Tax Liabilities, Financing Costs.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions attributable to income recognized only for tax purposes and which will reverse when recognized under generally accepted accounting principles.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43

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The sum of the tax effects as of the balance sheet date of the amounts of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws ( before the valuation allowance, if any, to reduce such sum amount to net realizable value). Includes any tax benefit realized in deferred tax assets for significant impacts of tax planning strategies.

+ References

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For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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The tax effect as of the balance sheet date of the amount of estimated future tax deductions arising from other temporary differences not otherwise specified in the taxonomy.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance.

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The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cumulative amount of all deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of an asset or liability in the financial statements prepared in accordance with generally accepted accounting principles that will result in taxable amounts in one or more future periods.

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The cumulative amount of the estimated future tax effects attributable to other temporary differences not otherwise specified in this taxonomy that were expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, or which were recognized as revenue under GAAP but not for tax purposes, which will reverse in future periods.

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The amount as of the balance sheet date of the estimated future tax effects arising from revenue or other income not otherwise listed in the existing taxonomy that is included in accounting income in conformity with generally accepted accounting principles but excluded from tax-basis income, which will increase future taxable income when such income is recognized for tax purposes.

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