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Sale Of Stock, Percentage Of Vested Holdings Permitted For Repurchase

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Share-Based Compensation Arrangement By Share-Based Payment Award, Increase Of Number Of Shares Available For Issuance

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Share-based Compensation Arrangement By Share-based Payment Award, Shares Subject To Repurchase

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Share-based Compensation Arrangement By Share-based Payment Award, Shares Subject To Repurchase, Aggregate Price

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Stock Issued During Period, Shares, Share-based Compensation, Nonvested Options Exercised

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

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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 tax benefit for recognition of expense of award under share-based payment arrangement.

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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Stock-Based Compensation - Additional Information (Details) - USD ($)		1 Months Ended			12 Months Ended
	Nov. 16, 2017	Jul. 31, 2017	Jan. 31, 2017	Dec. 31, 2016	Aug. 03, 2019	Jul. 28, 2018	Jul. 29, 2017	Aug. 04, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of outstanding stock maximum					5.00%
Weighted-average grant date fair value of options granted (in dollars per share)					$ 11.60	$ 8.40	$ 9.11
Grant date fair value of options vested					$ 13,100,000	$ 8,500,000	$ 2,600,000
Aggregate intrinsic value					49,100,000	59,600,000	17,400,000
Income tax benefit related to stock-based compensation					8,900,000	$ 4,700,000	$ 1,300,000
Unrecognized compensation expense related to unvested options and RSUs, net of forfeitures					$ 147,900,000
Unrecognized compensation expense, period for recognition					3 years
Stock based compensation related to periods prior to IPO					$ 500,000
Shares subject to repurchase (in shares)						160,417	702,144
Aggregate price of shares subject to repurchase						$ 200,000	$ 1,200,000
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					0
Number of shares available for grant					1,133,258	3,743,623
Term of award					10 years
Dividend yield					0.00%	0.00%	0.00%
Cash tender offer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation							$ 8,300,000
Price per share (in dollars per share)				$ 22.61
Percentage of vested holdings permitted for repurchase				10.00%
Number of shares issued in transaction				526,620
Consideration				$ 11,900,000
Stock sales by current and former employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation							13,000,000.0
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation					$ 35,200,000	$ 15,400,000	3,400,000
Non-Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation					$ 100,000	$ 100,000	$ 200,000
Certain Members Of Executive Management Team \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		24 months
Aggregate grant date fair value		$ 14,000,000.0
Stock based compensation related to periods prior to IPO	$ 0	$ 500,000
25% vested on first anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
25% vested on first anniversary \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
25% vested on second anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
25% vested on second anniversary \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
25% vested on third anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
25% vested on third anniversary \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
25% vested on fourth anniversary \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
25% vested on fourth anniversary \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					25.00%
Common Class B \| Certain Members Of Executive Management Team \| Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares)		1,097,463
Series C \| Stock sales by current and former employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in transaction			85,000
Consideration			$ 1,900,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for exercised unvested stock options (in shares)							111,557
Common Stock \| Stock sales by current and former employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued in transaction			554,799
Consideration			$ 12,500,000
2011 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized							23,223,374
Number of shares available for grant							2,023,424
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					17,137,824	17,137,824
Subsequent Event \| 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase of number of shares available for issuance								5,069,874