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Stockholders' Equity - Summary of Activities Related to Stock Repurchase Program (Detail) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended	165 Months Ended
	Jan. 27, 2017 USD ($) $ / shares shares	Jan. 27, 2017 USD ($) $ / shares shares
Equity [Abstract]
Number of shares repurchased | shares	18	266
Average price per share | $ / shares	$ 31.19	$ 32.74
Aggregate purchase price	$ 576
Remaining authorization at end of period	$ 924	$ 924

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Total cost of shares repurchased divided by the total number of shares repurchased.

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