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Employee Benefits and Deferred Compensation - Schedule of Defined Benefit Plans (Detail) - USD ($) $ in Millions	Apr. 30, 2021	Apr. 24, 2020
Compensation And Retirement Disclosure [Abstract]
Fair value of plan assets	$ 38	$ 32
Benefit obligations	(72)	(59)
Unfunded obligations	$ (34)	$ (27)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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