Employees' Stock Incentive Plans and Management Incentive Plans 6 (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
Apr. 28, 2013	Apr. 29, 2012	Apr. 27, 2011	Apr. 28, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses relating to RSUs and restricted stock	$ 23.6	$ 25.7	$ 23.2
Unrecognized compensation costs	4.6	6.4
Weighted average period of recognition for unrecognized compensation costs	1 year 6 months
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 24.9	$ 27.6	$ 29.4
Weighted average period of recognition for unrecognized compensation costs	1 year 8 months 12 days
Number of shares authorized	9,440	9,400
Number of shares reserved for issuance	(6,842)
Number of shares returned to the plan	1,779
Shares available for grant	4,377
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested units and stock, Number of Units, Beginning Balance	1,270	1,296	1,496
Units and stock granted, Number of Units	464	526	574
Units and stock vested, Number of Units	(567)	(520)	(725)
Units and stock cancelled/forfeited and returned to the plan, Number of Units	(53)	(32)	(49)
Unvested units and stock, Number of Units, Ending Balance	1,114	1,270	1,296
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Units and stock granted, Weighted Grant Date Fair Value	$ 51.24	$ 47.75	$ 44.84	$ 44.13
Units and stock granted, Weighted Grant Date Fair Value	$ 55.88	$ 52.31	$ 46.74
Units and stock vested, Weighted Grant Date Fair Value	$ 47.33	$ 45.27	$ 44.96
Units and stock cancelled/forfeited and returned to the plan, Weighted Grant Date Fair Value	$ 50.01	$ 45.90	$ 43.47

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Returned to Plan

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Aggregate number of common shares reserved for future issuance.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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