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Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Aug. 03, 2019	Apr. 27, 2019
Debt Securities, Available-for-sale [Line Items]
One Year or Less	$ 143,276
Over One Year Through Five Years	53,372
Over Five Years	0
Debt Securities, Available-for-sale	196,648
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
One Year or Less	44,772
Over One Year Through Five Years	5,135
Over Five Years		$ 0
Debt Securities, Available-for-sale	49,907
Commercial paper
Debt Securities, Available-for-sale [Line Items]
One Year or Less	29,761
Over One Year Through Five Years	0
Over Five Years		0
Debt Securities, Available-for-sale	29,761
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
One Year or Less	5,412
Over One Year Through Five Years	37,320
Over Five Years		0
Debt Securities, Available-for-sale	42,732
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
One Year or Less	63,331
Over One Year Through Five Years	10,917
Over Five Years		$ 0
Debt Securities, Available-for-sale	$ 74,248

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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