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Stock-Based Compensation (Tables)

12 Months Ended

Aug. 03, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Shares Available For Grant

The following table summarizes the shares available for grant under the 2017 Plan:

		Shares Available for Grant
Balance – July 28, 2018		3,743,623
Authorized		—
Granted		(4,113,084	)
Cancelled		1,502,719
Balance – August 3, 2019		1,133,258

Schedule of Stock Option Activity

Stock option activity under the 2011 Plan and 2017 Plan is as follows:

		Options Outstanding
		Number of Options			Weighted- Average Exercise Price				Weighted- Average Remaining Contractual Life (in Years)		Aggregate Intrinsic Value (in thousands)
Balance – July 28, 2018		9,052,160			$	11.74			8.23		$	160,856
Granted		1,090,890			24.77
Exercised		(2,198,655	)		6.79
Cancelled		(874,270	)		16.15
Balance – August 3, 2019		7,070,125			$	14.48			7.72		$	73,861
Options vested and exercisable - August 3, 2019		2,263,236			$	9.48			6.77		$	35,009
Options vested and expected to vest - August 3, 2019		6,450,028			$	14.40			7.61		$	69,652

Summary of Restricted Stock Unit Award Activity

The following table summarizes the restricted stock unit (“RSU”) award activity under the 2017 Plan:

		Unvested RSUs
		Class A Common Stock			Weighted- Average Grant Date Fair Value
Unvested at July 28, 2018		2,432,326			$	21.58
Granted		3,022,194			30.25
Vested		(397,226	)		20.67
Forfeited		(628,449	)		23.50
Unvested at August 3, 2019		4,428,845			$	27.30

Summary of Black - Scholes Option - Pricing Model Assumptions Used in Estimating Fair Value of Stock Options

The fair value of stock options granted to employees was estimated at the grant date using the Black-Scholes option-pricing model with the following assumptions:

		For the Fiscal Year Ended
		August 3, 2019			July 28, 2018			July 29, 2017
Expected term (in years)		5.1 - 6.5			5.4 - 6.6			5.1 - 7.7
Volatility		41.7 - 52.2%			41.4 - 43.5%			42.6 - 46.0%
Risk free interest rate		2.3 - 3.0%			1.9 - 3.0%			1.3 -2.3%
Dividend yield		—	%		—	%		—	%

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Tabular disclosure of the change in restricted stock units (RSUs).

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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