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Convertible Senior Notes - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 22, 2019 USD ($) shares | Jul. 19, 2019 USD ($) $ / shares | Sep. 23, 2019 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jul. 31, 2019 USD ($) | Jul. 16, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs |  |  |  |  | $ 278,555,000 |  |  |
Accretion of the debt discount |  |  |  |  | 4,863,000 | $ 3,160,000 |  |
Transaction costs attributable to equity component |  |  |  | $ 1,621,000 | 1,621,000 |  |  |
Total consideration on conversion |  |  |  |  | 198,757,000 |  |  |
Equity component of converted debt |  |  |  | 38,088,000 | 38,088,000 |  |  |
Loss on extinguishment of debt |  |  |  | $ (5,650,000) | (5,650,000) |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Conversion of Convertible Securities Stock Issued | shares | shares |  |  |  | 2,316,200 |  |  |  |
0.375% Convertible Senior Notes due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes issued |  | $ 287,500,000 |  |  |  |  | $ 287,500,000 |
Notes, interest rate |  | 0.375% |  |  |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs |  | $ 278,600,000 |  |  |  |  |  |
Interest repayment terms |  | Interest is payable semi-annually in arrears on January 15 and July 15 of each year, beginning on January 15, 2020 |  |  |  |  |  |
Notes, due date |  | Jul. 15, 2024 |  |  |  |  |  |
Notes conversion ratio per $1,000 principal amount |  | 8.6749 |  |  |  |  |  |
Notes initial conversion price | $ / shares |  | $ 115.28 |  |  |  |  |  |
Notes redemption price |  | 100.00% |  |  |  |  |  |
Contractual coupon interest |  |  |  | $ 200,000 | 200,000 |  |  |
Accretion of the debt discount |  |  |  | 1,800,000 | 1,800,000 |  |  |
Amortization of the debt issuance costs |  |  |  | $ 300,000 | $ 300,000 |  |  |
Effective interest rate on the Notes |  |  |  | 5.10% | 5.10% |  |  |
Notes, carrying value |  |  |  | $ 230,200,000 | $ 230,200,000 |  |  |
Fair value of the note |  |  |  | 287,900,000 | $ 287,900,000 |  |  |
Additional Notes issued |  | $ 37,500,000 |  |  |  |  |  |
Discount rate |  |  |  |  | 4.50% |  |  |
Proceeds allocated to the conversion feature |  |  |  |  | $ 52,100,000 |  |  |
Transaction costs attributable to liability component |  |  |  |  | 7,300,000 |  |  |
Transaction costs attributable to equity component |  |  |  | 1,600,000 | 1,600,000 |  |  |
2.125% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes issued |  |  |  | 115,000,000.0 | 115,000,000.0 |  |  | $ 92,000,000.0
Notes, interest rate |  |  |  |  |  |  |  | 2.125%
Notes redemption price |  |  | 100.00% |  |  |  |  |
Notes issued, fair value |  |  |  | 96,300,000 | 96,300,000 |  |  |
Contractual coupon interest |  |  |  | 100,000 | 1,300,000 |  |  |
Accretion of the debt discount |  |  |  | 500,000 | 2,400,000 |  |  |
Amortization of the debt issuance costs |  |  |  | $ 100,000 | $ 400,000 |  |  |
Effective interest rate on the Notes |  |  |  | 6.60% | 6.60% |  |  |
Repayment Of Senior Debt |  | 92,300,000 | $ 23,000,000.0 |  |  |  |  |
Accrued interest |  | $ 300,000 |  |  |  |  |  |
Total consideration on conversion | $ 253,300,000 |  |  |  |  |  |  |
Face amount of remaining convertible debt |  |  | 60,800,000 |  |  |  |  |
Equity component of converted debt | $ 163,600,000 |  | 38,300,000 |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 1,100,000 | $ 4,500,000 | $ 4,500,000 |  |  |
2.125% Convertible Senior Notes due 2021 | Common Stock [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Conversion of Convertible Securities Stock Issued | shares | shares | 1,850,155 |  | 466,045 |  |  |  |  |
Conversion of Convertible Securities Stock Issued | value | $ 161,000,000.0 |  | $ 37,800,000 |  |  |  |  |
2.125% Non Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes, due date |  |  |  |  | Jun. 01, 2021 |  |  |
Effective interest rate on the Notes |  |  |  | 3.90% | 3.90% |  |  |
Equity component of converted debt |  |  |  | $ 200,100,000 | $ 200,100,000 |  |  |

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