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As of the balance sheet date, the aggregate unrecognized cost of stock options made to employees that have yet to vest.

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The total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period, net of tax.

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Amount plan participants have had withheld to purchase Company common stock on the last trading day before the end of the calendar quarter purchase period.

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The average price of shares purchased during the period under the Employee Stock Purchase Plan.

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The employee stock purchase plan's employee discount off as a percent of the market price.

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Under the employee stock purchase plan, the percentage of their wages that the employee can purchase up to.

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The employee stock purchase plan's employee price paid as a percent of the market price.

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The number of common shares available for grant under the employee stock purchase plan.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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Gross number of share options (or share units) granted during the period.

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Stock-Based Compensation Abstract

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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The total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period.

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The cash inflow associated with the amount received from holders exercising their stock options.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.

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The estimated measure of the percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The number of shares into which fully or partially vested stock options outstanding as of the balance-sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance-sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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-Name Statement of Financial Accounting Standard (FAS)
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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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For presentations that combine terminations, the weighted average price of expired options and the price at which grantees could have acquired the underlying shares with respect to stock options that were terminated during the reporting period due to noncompliance with plan terms during the reporting period .

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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-Publisher FASB
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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Name Statement of Financial Accounting Standard (FAS)
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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance-sheet date.

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-Publisher FASB
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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance-sheet date, including vested options.

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-Publisher FASB
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-Name Statement of Financial Accounting Standard (FAS)
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of shares issued during the period as a result of the exercise of stock options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 04
-Article 3

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified stock options) recognized on the entity's tax return exceeds compensation cost from non-qualified stock options recognized on the income statement. This element increases net cash provided by operating activities.

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Stock Purchase and Awards Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended														12 Months Ended
	Apr. 29, 2011 Years	Apr. 30, 2010 Years	Apr. 24, 2009 Years	Apr. 29, 2011 Employee Stock Option [Member]	Apr. 30, 2010 Employee Stock Option [Member]	Apr. 24, 2009 Employee Stock Option [Member]	Apr. 29, 2011 Restricted Stock Awards [Member]	Apr. 30, 2010 Restricted Stock Awards [Member]	Apr. 24, 2009 Restricted Stock Awards [Member]	Apr. 29, 2011 Performance-based Restricted Stock Awards [Member]	Apr. 29, 2011 Employee Stock Purchase Plan [Member]	Apr. 30, 2010 Employee Stock Purchase Plan [Member]	Apr. 24, 2009 Employee Stock Purchase Plan [Member]	Jun. 30, 2010 Employee Stock Purchase Plan [Member]	Apr. 29, 2011 Cost of Products Sold [Member]	Apr. 30, 2010 Cost of Products Sold [Member]	Apr. 24, 2009 Cost of Products Sold [Member]	Apr. 29, 2011 Research and Development Expense [Member]	Apr. 30, 2010 Research and Development Expense [Member]	Apr. 24, 2009 Research and Development Expense [Member]	Apr. 29, 2011 Selling, General and Administrative Expense [Member]	Apr. 30, 2010 Selling, General and Administrative Expense [Member]	Apr. 24, 2009 Selling, General and Administrative Expense [Member]	Apr. 29, 2011 Kyphon Unvested Stock-based Awards [Member]	Apr. 30, 2010 Kyphon Unvested Stock-based Awards [Member]	Apr. 24, 2009 Kyphon Unvested Stock-based Awards [Member]	Nov. 30, 2007 Kyphon Unvested Stock-based Awards [Member] Years
Stock-Based Compensation [Abstract]
Income tax benefits	$ (58)	$ (67)	$ (69)
Total stock-based compensation, net of tax	140	158	168
Proceeds from Stock Options Exercised	21
Tax Benefit from Stock Options Exercised	1
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology
Weighted average fair value of options granted (per share)	$ 8.19	$ 8.77	$ 8.96
Expected Term (in years)	6.30	6.16	6.05
Risk Free Interest Rate	2.25%	3.17%	3.11%
Expected Volatility Rate	26.03%	26.91%	25.64%
Expected Dividend Rate	2.40%	2.29%	2.03%
Options, Outstanding, Weighted Average Remaining Contractual Term (in years)	4.77
Options, Exercisable, Weighted Average Remaining Contractual Term (in years)	3.81
Options, Exercises in Period, Total Intrinsic Value	4	19	105
Options, Outstanding, Intrinsic Value	134
Options, Exercisable, Intrinsic Value	50
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-Based Compensation Expense	198	225	237	87	112	140	97	98	82		14	15	15		22	26	28	49	55	58	127	144	151	4	12	21
Award Vesting Period (in years)				4Y			4Y			3Y
Share-based Payment Award, Term (in years)				10Y
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	20,700,000
Employee Stock Purchase Plan, Employee Percent of Wages, Maximum Contributed											10.00%
Employee Stock Purchase Plan, Employee Price, Paid as Percent of Market Price														85.00%
Employee Stock Purchase Plan, Average Price of Purchased Shares (per share)											$ 30.83
Employee Stock Purchase Plan, Amount Withheld to Purchase											8
Employee Stock Purchase Plan, Outstanding Common Shares Available for Grant (in shares)				53,000,000							12,000,000
Employee Stock Purchase Plan, Employee Discount											15.00%
Nonvested Stock Options, Total Compensation Cost Not yet Recognized	101
Nonvested Stock Options, Total Compensation Cost Not yet Recognized, Period for Recognition (in years)	2.2
Nonvested Restricted Awards, Total Compensation Cost Not yet Recognized	$ 142
Nonvested Restricted Awards, Total Compensation Cost Not yet Recognized, Period for Recognition (in years)	2.5																										2.5
Options, Outstanding (in shares) [Roll Forward]
Beginning Balance	89,613,000	93,394,000	92,444,000
Granted	6,371,000	7,863,000	12,447,000
Exercised	(627,000)	(3,126,000)	(8,046,000)
Canceled	(10,705,000)	(8,518,000)	(3,451,000)
Outstanding at year-end	84,652,000	89,613,000	93,394,000
Exercisable at year-end	66,286,000	67,944,000	67,795,000
Options, Additional Disclosures (per share)
Beginning Balance	$ 46.13	$ 46.57	$ 47.21
Granted	$ 37.59	$ 35.81	$ 37.25
Exercised	$ 32.84	$ 32.96	$ 39.01
Canceled	$ 48.91	$ 46.27	$ 47.59
Outstanding at year-end	$ 45.23	$ 46.13	$ 46.57
Exercisable at year-end	$ 47.24	$ 48.24	$ 47.78