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Convertible Senior Notes, Net (Detail) $ / shares in Units, shares in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) day trading_day $ / shares shares | Apr. 30, 2017 USD ($) | Jan. 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Threshold consecutive trading days | trading_day | 30 |  |  |  |
Number of days out of 30 that common stock price exceeded conversion price (in days) | day | 20 |  |  |  |
Capitalized interest costs | $ 2,000,000 | $ 1,000,000 |  |  |
2018 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual interest rate | 0.75% |  |  |  | 0.75%
Convertible senior notes, principal amount | $ 350,000,000 |  | $ 350,000,000 |  | $ 350,000,000
Liability issuance costs | 7,000,000 |  |  |  |
Equity issuance costs | 2,000,000 |  |  |  |
Amortization expense for liability issuance costs | $ 352,000 | 352,000 |  |  |
Remaining life of the Notes | 2 months |  |  |  |
Effective interest rates of the liability components | 5.75% |  |  |  |
2020 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual interest rate | 1.50% |  |  |  | 1.50%
Convertible senior notes, principal amount | $ 250,000,000 |  | $ 250,000,000 |  | $ 250,000,000
Threshold percentage of conversion price | 130.00% |  |  |  |
Liability issuance costs | $ 5,000,000 |  |  |  |
Equity issuance costs | 2,000,000 |  |  |  |
Amortization expense for liability issuance costs | $ 168,000 | 168,000 |  |  |
Remaining life of the Notes | 26 months |  |  |  |
Effective interest rates of the liability components | 6.25% |  |  |  |
2022 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual interest rate | 0.25% |  |  | 0.25% |
Convertible senior notes, principal amount |  |  |  | $ 1,150,000,000.00 |
Liability issuance costs | $ 14,000,000 |  |  |  |
Equity issuance costs | 4,000,000 |  |  |  |
Amortization expense for liability issuance costs | $ 714,000 | $ 0 |  |  |
Remaining life of the Notes | 53 months |  |  |  |
Effective interest rates of the liability components | 4.60% |  |  |  |
Aggregate amount for purchased options | $ 176,000,000 |  |  |  |
Proceeds from sale of warrants | $ 81,000,000 |  |  |  |
Shares related to the convertible senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repurchase of notes percentage | 100.00% |  |  |  |
Warrants expires in October 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Shares covered by each purchased options or warrants (in shares) | shares | 4.2 |  |  |  |
Number of trading days over | 60 days |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 107.96 |  |  |  |
Warrants expires in October 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Shares covered by each purchased options or warrants (in shares) | shares | 3.1 |  |  |  |
Number of trading days over | 60 days |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 107.96 |  |  |  |
Warrants Expires In January 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Shares covered by each purchased options or warrants (in shares) | shares | 7.8 |  |  |  |
Number of trading days over | 60 days |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares | $ 213.96 |  |  |  |
2018 and 2020 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate amount for purchased options | $ 144,000,000 |  |  |  |
Proceeds from sale of warrants | $ 93,000,000 |  |  |  |
Class A | 2018 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Initial conversion rate | 12.0075 |  |  |  |
Principal amount converted into Class A Common Stock | $ 1,000 |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 83.28 |  |  |  |
Debt conversion, shares issued | shares | 4.2 |  |  |  |
Class A | 2020 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Initial conversion rate | 12.2340 |  |  |  |
Principal amount converted into Class A Common Stock | $ 1,000 |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 81.74 |  |  |  |
Debt conversion, shares issued | shares | 3.1 |  |  |  |
Class A | 2022 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Initial conversion rate | 6.7982 |  |  |  |
Principal amount converted into Class A Common Stock | $ 1,000 |  |  |  |
Initial conversion price (in dollars per share) | $ / shares | $ 147.10 |  |  |  |
Debt conversion, shares issued | shares | 7.8 |  |  |  |
Debt Conversion, Option One | Shares related to the convertible senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Threshold trading days (in trading days) | trading_day | 20 |  |  |  |
Threshold consecutive trading days | trading_day | 30 |  |  |  |
Threshold percentage of conversion price | 130.00% |  |  |  |
Debt Conversion, Option Two | Shares related to the convertible senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Threshold trading days (in trading days) | trading_day | 5 |  |  |  |
Debt Conversion, Option Two | Shares related to the convertible senior notes | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Threshold percentage of conversion price | 98.00% |  |  |  |

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