Common Stock, Capital Shares Reserved for Future Issuance, Annual Increase

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

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Share-based Compensation Arrangement by Share-based Payment Award, Monetary Cap

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Six Month Purchase Periods

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Share-based Compensation Arrangement by Share-based Payment Award, Offering Period Duration

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Unvested, Number

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Vested, Number

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercise Price, Percent of Estimated Fair Value

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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The cash inflow associated with the amount received from the stock plan during the period.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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

Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual 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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No definition available.

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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

The highest quantity of shares an employee can purchase under the plan per period.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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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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- Definition

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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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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- Definition

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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- Definition

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

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No definition available.

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of share options (or share units) exercised during the current period.

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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EQUITY AWARD PLANS - Additional Information (Details)			1 Months Ended	12 Months Ended
EQUITY AWARD PLANS - Additional Information (Details)	Aug. 01, 2018 shares	Aug. 01, 2017 shares	Oct. 31, 2016 USD ($) purchase_period shares	Jul. 31, 2018 USD ($) $ / shares shares	Jul. 31, 2017 USD ($) $ / shares shares	Jul. 31, 2016 USD ($)	Sep. 30, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)				47,815,755
Period for recognition (in years)				2 years 8 months 12 days
Vested (in shares)				9,660,757	15,241,715
Nonvested shares (in shares)				1,498,288	4,403,961
Grants in period, weighted average grant date fair value (in dollars per share) \| $ / shares				$ 6.41	$ 6.36
Exercises in period, intrinsic value \| $				$ 289,400,000	$ 73,900,000	$ 18,300,000
Proceeds from Stock Options Exercised \| $				33,100,000	15,600,000	3,500,000
Options vested in period, fair value \| $				$ 11,500,000	$ 16,100,000	$ 23,900,000
Early exercised options (in shares)				11,332,554	20,334,531
Issuance of common stock upon exercise of stock options (in shares)				8,672,623	4,786,381
Dividend yield \| $				$ 0
2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)				46,133,294
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Expiration period (in years)				10 years
Incentive Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, percent of estimated fair value				100.00%
Non-qualified Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price, percent of estimated fair value				100.00%
Early Exercised Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Early exercised options (in shares)				243,148
Number of shares authorized to be repurchased (in shares)				47,691
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				14,947,403	12,986,597
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of eligible compensation (up to)			15.00%
Monetary cap \| $			$ 25,000
Share cap (in shares)			1,000
Offering period duration (in months)			12 months
Number of six-month purchase periods \| purchase_period			2
Purchase price of common stock, percent			85.00%
Issuance of common stock from ESPP purchase (in shares)				2,417,850
Proceeds from Stock Plans \| $				$ 39,000,000
Employee Stock Options Excluding Performance Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized \| $				$ 647,900,000
Common Class A \| 2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)			22,400,000
Number of shares available for grant (in shares)				11,169,061.000
Annual increase (in shares)				18,000,000
Annual increase, percent of outstanding shares				5.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	8,642,904	7,731,826
Common Class A \| Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)							3,800,000
Annual increase (in shares)			3,800,000
Annual increase, percent of outstanding shares			1.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		1,546,365
Common Class A \| Employee Stock \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,728,580
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)				1,682,461.000
Principal Owner \| Incentive Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)				5 years
Exercise price, percent of estimated fair value				110.00%