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OVERVIEW AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 shares | Oct. 31, 2016 USD ($) class $ / shares shares | Jul. 31, 2018 USD ($) vote | Jul. 31, 2017 USD ($) shares | Jul. 31, 2016 USD ($) | Nov. 01, 2016 vote class
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Impairment losses |  |  | $ 0 | $ 0 | $ 0 |
Issuance of common stock upon initial public offering (in shares) | shares |  | 17,100,500 |  |  |  |
Shares issued price per share (in dollars per share) | $ / shares |  | $ 16.00 |  |  |  |
Issuance of class A common stock upon IPO, net of issuance costs |  | $ 254,500 |  | 249,170 |  |
Underwriting discounts and commissions |  | $ (19,200) |  |  |  |
Offering costs incurred |  |  | 5,300 |  |  |
Common stock, number of classes of stock | class |  | 2 |  |  |  | 2
Foreign currency transaction gain (loss), before tax |  |  | (3,600) | (2,600) | (1,500) |
Advertising expense |  |  | 14,600 | $ 13,000 | $ 6,500 |
Operating lease commitments (in excess of) |  |  | $ 100,000 |  |  |
Hardware |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Warranty duration, hardware (in years) |  |  | 1 year |  |  |
Product warranty replacement period (in years) |  |  | 3 years |  |  |
Software |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Warranty duration, hardware (in years) |  |  | 90 days |  |  |
Common Class B Warrant |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of warrants exercised (in shares) | shares | 824,024 |  |  |  |  |
Common Stock |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Issuance of common stock upon initial public offering (in shares) | shares |  |  |  | 17,100,500 |  |
Issuance of class A common stock upon IPO, net of issuance costs |  |  |  | $ 1 |  |
Conversion of convertible preferred stock to common stock upon initial public (in shares) | shares |  |  |  | 76,319,511 |  |
Preferred Class B | Common Stock |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Conversion of convertible preferred stock to common stock upon initial public (in shares) | shares |  | 76,319,511 |  |  |  |
Common Class B |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Common stock number of votes per share | vote |  |  | 10 |  |  | 10
Common Class B | Common Stock |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Conversion ratio |  | 1 |  |  |  |
Common Class A |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Common stock number of votes per share | vote |  |  | 1 |  |  | 1
Over-Allotment Option |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Issuance of common stock upon initial public offering (in shares) | shares |  | 2,230,500 |  |  |  |

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