Stockholder Rights Plan Exercise Trigger Threshold Percentage Voting Stock Ownership Offer

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

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Price of a single share of a number of saleable stocks of a company.

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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 during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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Shareholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Oct. 03, 2018	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018	Apr. 28, 2018	Mar. 15, 2017
Class of Stock [Line Items]
Treasury stock repurchased, shares		0	0	0	0
Treasury stock, shares		39,738,000	39,585,000	39,738,000	39,585,000	39,585,000
Treasury stock, at cost		$ 1,122,571,000	$ 1,121,724,000	$ 1,122,571,000	$ 1,121,724,000	$ 1,121,724,000
Stockholder Rights Plan [Member]
Class of Stock [Line Items]
Share of Series K Preferred Stock, par value	$ 0.001
Share price	$ 24.00
Ownership trigger threshold	20.00%
Dividends payable, date of record	Oct. 13, 2018
Maximum
Class of Stock [Line Items]
Number of shares authorized to be repurchase							$ 50,000,000
New Stock Repurchase Program
Class of Stock [Line Items]
Stock repurchase program, remaining authorized repurchase amount		$ 50,000,000		$ 50,000,000
Stock Repurchase Program
Class of Stock [Line Items]
Treasury stock, shares		39,737,720,000		39,737,720,000
Treasury stock, at cost		$ 1,087,913,000		$ 1,087,913,000