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DEBT - Additional Information (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 USD ($) day | Sep. 30, 2016 USD ($) | Jul. 31, 2018 USD ($) $ / shares shares | Jul. 31, 2017 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | $ (3,300,000) | $ 0 | $ (3,320,000) | $ 0 |
Write off of Deferred Debt Issuance Cost |  | 1,700,000 |  |  |  |
Gain (Loss) on Extinguishment of Debt, before Write off of Debt Issuance Cost |  | $ (1,600,000) |  |  |  |
Payments for convertible note hedges |  |  | $ 143,175,000 | $ 0 | $ 0 |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares |  |  | 11.8 |  |  |
Exercise Price per Share (in dollars per share) | $ / shares |  |  | $ 73.46 |  |  |
Proceeds from Issuance of Warrants |  |  | $ 88,000,000 |  |  |
Net Transaction Cost of the Note Hedges and Warrants |  |  | $ 55,200,000 |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities | shares |  |  | 3.9 |  |  |
Share Price Threshold for Dilutive Effect of Convertible Debt | $ / shares |  |  | $ 73.46 |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants, $10 Increase in Share Price | shares |  |  | 4.9 |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants | shares |  |  | 1.4 |  |  |
Share Price Threshold for Dilutive Effect of Warrants | $ / shares |  |  | $ 83.46 |  |  |
Senior Notes [Member] | Senior Notes Due April 15, 2019 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 75,000,000
Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 575,000,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 0.00% |  |  |  |  |
Convertible Debt |  |  | $ 75,000,000 |  |  |
Debt Instrument, Convertible, Conversion Ratio | 20.4705 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | $ / shares |  |  | $ 48.85 |  |  |
Payments for convertible note hedges | $ 143,175,000 |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | day | 20 |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | day | 30 |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | 130.00% |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Liability Component |  |  | $ 423,400,000 |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  | 151,600,000 |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net |  |  | 11,500,000 |  |  |
Convertible Debt Issuance Cost | $ 10,781,000 |  | 10,800,000 |  |  |
Debt Issuance Cost, Gross, Noncurrent | 707,000 |  | 700,000 |  |  |
Debt Instrument, Convertible, Transaction Costs Attributable to Liability Component |  |  | 8,500,000 |  |  |
Debt Instrument, Convertible, Transaction Costs Attributable to Equity Component |  |  | $ 3,000,000 |  |  |
Remaining Term of Convertible Debt |  |  | 53 months |  |  |
Proceeds from Issuance of Warrants | $ 87,975,000 |  |  |  |  |
Common Class A |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fair value of common stock (in dollars per share) | $ / shares |  |  | $ 48.89 |  |  |
Common Class A | Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | 98.00% |  |  |  |  |

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