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Stockholders' Equity - Reconciliation of Retained Earnings (Accumulated Deficit) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 26, 2018	Jan. 27, 2017	Jan. 26, 2018	Jan. 27, 2017
Retained Earnings Adjustments [Line Items]
Beginning balance			$ 40
Net loss	$ (506)	$ 146	(195)	$ 319
Repurchases of common stock			(450)
Ending balance	$ (489)		(489)
Retained Earnings
Retained Earnings Adjustments [Line Items]
Repurchases of common stock			(226)
Dividends			$ (108)