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Employee Benefits and Deferred Compensation - Schedule of Defined Benefit Plans (Detail) - USD ($) $ in Millions	Apr. 24, 2020	Apr. 26, 2019
Compensation And Retirement Disclosure [Abstract]
Fair value of plan assets	$ 32	$ 31
Benefit obligations	(59)	(61)
Unfunded obligations	$ (27)	$ (30)

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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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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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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