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Stockholders' Equity - Narrative (Details) shares in Thousands, $ in Thousands		3 Months Ended		12 Months Ended
	Apr. 26, 2018 USD ($)	Apr. 30, 2019 USD ($) plan shares	Apr. 30, 2018 USD ($)	Jan. 31, 2019 shares	Feb. 01, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans | plan		3
Unrecognized compensation cost, options | $		$ 11,000
Employee stock purchase plan, compensation expense | $		$ 42,271	$ 269,794
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, remaining weighted-average period for recognition		1 year 7 months 6 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, remaining weighted-average period for recognition		2 years 2 months 12 days
Service period		4 years
Accelerated share based compensation expense | $	$ 262,800
Shares granted (in shares)		1,174
Unrecognized compensation cost, RSUs | $		$ 51,200
RSUs with vesting conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)				700
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, shares purchased (in shares)		200
Employee stock purchase plan, compensation expense | $		$ 1,900
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares)		26,800
Annual increase in shares reserved, percentage of total shares		5.00%
Number of shares reserved for future issuance					8,500
2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares)		5,300		3,800
Annual increase in shares reserved, percentage of total shares				1.00%
Employee contribution, maximum percentage of earnings				15.00%
Employee stock purchase plan, purchase price of common stock, percent of market price				85.00%
Employee stock purchase plan offering period		6 months

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