Capital Shares Reserved for Future Issuance, Annual Increase, Percentage of Stock Outstanding

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- Definition

Common Stock, Additional Capital Shares Reserved For Future Issuance

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Plans

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Share-Based Compensation Arrangement By Share-Based Payment Award, Offering Period

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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No definition available.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

Number of shares issued under share-based payment arrangement.

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

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Stockholders' Equity - Narrative (Details) shares in Thousands, $ in Thousands		3 Months Ended	6 Months Ended		12 Months Ended
	Apr. 26, 2018 USD ($)	Jul. 31, 2019 USD ($) plan shares	Jul. 31, 2019 USD ($) plan shares	Jul. 31, 2018 USD ($)	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	3
Unrecognized compensation cost, options \| $		$ 8,800	$ 8,800
Employee stock purchase plan, compensation expense \| $			$ 98,063	$ 309,959
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, remaining weighted-average period for recognition			1 year 4 months 24 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, remaining weighted-average period for recognition			2 years 4 months 24 days
Service period			4 years
Accelerated share based compensation expense \| $	$ 262,800
Unvested subject to performance based conditions (in shares)		16,439	16,439		17,142
Shares granted (in shares)			4,760
Unrecognized compensation cost, RSUs \| $		$ 498,300	$ 498,300
Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested subject to performance based conditions (in shares)		300	300
Restricted Stock Units with Market-based Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested subject to performance based conditions (in shares)		200	200
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 \| $		$ 2,100	$ 4,000
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares)		24,300	24,300
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	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