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Debt - Additional Information (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 10, 2018 | Aug. 15, 2018 | May 29, 2018 | Mar. 03, 2017 | Aug. 21, 2013 | Mar. 31, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Mar. 22, 2017
Debt details |  |  |  |  |  |  |  |  |  |
Repayments of convertible debt |  |  |  |  |  |  | $ 134,300,000 | $ 162,000,000 |  |
1.75% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible debt |  |  | $ 225,000,000.0 |  |  |  |  |  |  |
Interest rate on senior convertible notes |  |  | 1.75% |  |  |  | 1.75% |  |  |
Proceeds from convertible debt |  |  | $ 69,500,000 |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  | $ 67,300,000 |  |  |  |  |  |  |
Effective discount rate |  |  | 5.30% |  |  |  |  |  |  |
Derivative, term of contract |  |  | 5 years |  |  |  |  |  |  |
Expected remaining term |  |  |  |  |  |  | 4 years 7 months |  |  |
Amount outstanding |  |  |  |  |  |  | $ 225,000,000 |  | $ 225,000,000 |
Fair market value of convertible debt |  |  |  |  |  |  | $ 242,500,000 |  | 232,400,000 |
0.625% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible debt |  |  |  |  | $ 650,000,000.0 |  |  |  |  |
Interest rate on senior convertible notes |  |  |  |  | 0.625% |  | 0.625% |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  | $ 636,300,000 |  |  |  |  |
Effective discount rate |  |  |  |  | 5.40% |  |  |  |  |
Derivative, term of contract |  |  |  |  | 5 years |  |  |  |  |
Repayments of convertible debt |  | $ 134,300,000 |  |  |  |  |  |  |  |
Amount outstanding |  |  |  |  |  |  | $ 142,700,000 |  | 277,000,000 |
Fair market value of convertible debt |  |  |  |  |  |  | $ 144,300,000 |  | 281,000,000 |
1.00% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible debt |  |  |  | $ 400,000,000.0 |  |  |  |  |  | $ 60,000,000
Interest rate on senior convertible notes |  |  |  |  |  |  | 1.00% |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  |  | $ 451,100,000 |  |  |  |
Effective discount rate |  |  |  | 4.80% |  |  |  |  |  |
Derivative, term of contract |  |  |  | 7 years |  |  |  |  |  |
Expected remaining term |  |  |  |  |  |  | 5 years 5 months |  |  |
Amount outstanding |  |  |  |  |  |  | $ 460,000,000 |  | 460,000,000 |
Fair market value of convertible debt |  |  |  |  |  |  | $ 496,300,000 |  | $ 465,300,000 |
Subsequent Event | 0.625% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |  |  |  |
Debt redemption | $ 142,700,000 |  |  |  |  |  |  |  |  |
Debt redemption, percentage of principal amount redeemed | 100.00% |  |  |  |  |  |  |  |  |
Exchange Transaction | 1.75% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  |  | $ 155,500,000 |  |  |  |  |  |  |
Exchange Transaction | 0.625% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | $ 151,500,000 |  |  |  |  |  |  |

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