Derivatives and Hedging Activities - Schedule of Notional Value of Outstanding Foreign Currency Forward Contracts (Detail) - Foreign Exchange Forward Contracts - Non Designated - USD ($) $ in Millions	Apr. 27, 2018	Apr. 28, 2017
Short
Derivative [Line Items]
Forward contracts, Notional Amount	$ 115	$ 165
Long
Derivative [Line Items]
Forward contracts, Notional Amount	$ 412	$ 257

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant