Common stock capital shares reserved for future issuance decrease.

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Percentage of common stock issued to settle performance based restricted stock units of target shares granted.

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Share based compensation arrangement by share based payment award duration of offering period.

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Share based compensation arrangement by share based payment award duration of purchase period.

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Share based compensation arrangement by share based payment award maximum number value per employee.

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Share based compensation arrangement by share based payment award number of purchase periods.

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Share based compensation arrangement by share based payment award number of shares authorized per participant.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

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Unrecognized cost of unvested share-based compensation awards.

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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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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The cash outflow to reacquire common stock during the period.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on purchase date that participants pay for shares.

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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 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 estimated measure of the percentage 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The highest quantity of shares an employee can purchase under the plan per period.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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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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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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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Number of non-vested options outstanding.

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No definition available.

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Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Stockholders' Equity - Additional Information (Detail)			12 Months Ended			180 Months Ended
Stockholders' Equity - Additional Information (Detail)	May 23, 2018 $ / shares	Sep. 14, 2017 shares	Apr. 27, 2018 USD ($) Period $ / shares shares	Apr. 28, 2017 USD ($) $ / shares shares	Apr. 29, 2016 USD ($) $ / shares shares	Apr. 27, 2018 USD ($) $ / shares shares	Apr. 24, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to equity awards \| $			$ 206,000,000			$ 206,000,000
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years			2 years 2 months 12 days
Stock repurchase program, authorized amount \| $			$ 13,600,000,000			13,600,000,000
Stock repurchase program, remaining authorized repurchase amount \| $			4,000,000,000	$ 794,000,000	$ 1,499,000,000	$ 4,000,000,000
Allocation of purchase price of share repurchases \| $			$ 794,000,000	$ 705,000,000	$ 960,000,000
Repurchase of common stock, shares			15,000,000	22,000,000	33,000,000	284,000,000
Average price of common stock repurchased under repurchase program \| $ / shares			$ 51.57	$ 32.72	$ 28.80	$ 33.85
Aggregate purchase price of common stock authorized under repurchase program \| $			$ 794,000,000	$ 705,000,000	$ 960,000,000	$ 9,600,000,000
Preferred stock, shares authorized			5,000,000	5,000,000		5,000,000
Preferred stock, shares issued			0	0		0
Preferred stock, shares outstanding			0	0		0
Cash dividends declared, per common share \| $ / shares			$ 0.80	$ 0.76	$ 0.72
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividends declared, per common share \| $ / shares	$ 0.40
Cash dividend payable date	Jul. 25, 2018
Cash dividend record date	Jul. 06, 2018
Additional Paid-in Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocation of purchase price of share repurchases \| $			$ 568,000,000
Retained Earnings (Accumulated Deficit)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocation of purchase price of share repurchases \| $			226,000,000	$ 370,000,000	$ 197,000,000
Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, remaining authorized repurchase amount \| $			$ 4,000,000,000			$ 4,000,000,000
Solid Fire Acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options nonvested, number of shares					2,000,000
Expected term in years					4 years 3 months 18 days
Risk-free interest rate					1.10%
Expected volatility					31.00%
Expected dividend yield					3.30%
Weighted-average fair value per share granted \| $ / shares					$ 14.32
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Common stock issued to settle PBRSUs of target shares granted			0.00%	0.00%	0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of Common stock issued to settle PBRSUs of target shares granted			200.00%	200.00%	200.00%
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding			9,000,000	11,000,000	13,000,000	9,000,000	13,000,000
Risk-free interest rate			1.40%	1.00%	0.60%
Expected dividend yield			2.00%	3.10%	2.30%
Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs grant date fair value \| $			$ 20,000,000	$ 15,000,000	$ 20,000,000	$ 20,000,000
Awards outstanding			1,000,000	1,000,000		1,000,000
Performance Based Restricted Stock Unit \| PBRSU One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			2 years	2 years	2 years
Performance Based Restricted Stock Unit \| PBRSU Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years	3 years	3 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares of common stock authorized		3,000,000
Shares available for grant			8,000,000			8,000,000
Share offering period for eligible employees			24 months
Number of consecutive purchase periods \| Period			4
Duration of purchase period			6 months
Percentage of discount from quoted market price, employees entitled to buy shares (ESPP)			15.00%
Expected term in years			1 year 2 months 12 days	1 year 2 months 12 days	1 year 2 months 12 days
Risk-free interest rate			1.40%	0.80%	0.50%
Expected volatility			28.00%	30.00%	27.00%
Expected dividend yield			2.00%	3.10%	2.30%
1999 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in number of shares reserved for issuance for every share subject to a full value award			2
Number of shares that may be granted to a participant in any calendar year			1,000,000
Maximum initial value of performance units a participant may receive \| $			$ 5,000,000
Number of performance shares a participant may receive in a calendar year			1,000,000
Additional shares of common stock authorized			9,000,000
Shares available for grant			26,000,000			26,000,000
1999 Stock Option Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, percentage			100.00%
Vesting period			4 years
Options granted period term			7 years
1999 Stock Option Plan \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
1999 Stock Option Plan \| Restricted Stock Units \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate			25.00%
1999 Stock Option Plan \| Restricted Stock Units \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate			25.00%
1999 Stock Option Plan \| Restricted Stock Units \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate			25.00%
1999 Stock Option Plan \| Restricted Stock Units \| Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate			25.00%