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Debt - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 03, 2017 | Aug. 21, 2013 | Mar. 31, 2017 | Sep. 30, 2017 | Oct. 01, 2016 | Jul. 01, 2017 | Mar. 22, 2017
Debt details |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 3,600,000 | $ 0 |  |
1.00% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |
Interest rate on senior convertible notes |  |  |  | 1.00% |  |  |
Aggregate principal amount of convertible debt | $ 400,000,000 |  |  |  |  |  | $ 60,000,000
Proceeds from debt, net of issuance costs |  |  | $ 451,100,000 |  |  |  |
Discount rate | 4.80% |  |  |  |  |  |
Derivative, term of contract | 7 years |  |  |  |  |  |
Fair market value of convertible debt |  |  |  | $ 463,100,000 |  | $ 481,700,000 |
Amount outstanding |  |  |  | $ 460,000,000 |  | 460,000,000 |
0.625% Senior Convertible Notes | Convertible Notes |  |  |  |  |  |  |
Debt details |  |  |  |  |  |  |
Interest rate on senior convertible notes |  | 0.625% |  | 0.625% |  |  |
Aggregate principal amount of convertible debt |  | $ 650,000,000.0 |  |  |  |  |
Proceeds from debt, net of issuance costs |  | $ 636,300,000 |  |  |  |  |
Discount rate |  | 5.40% |  |  |  |  |
Derivative, term of contract |  | 5 years |  |  |  |  |
Redemption percentage |  | 100.00% |  |  |  |  |
Fair market value of convertible debt |  |  |  | $ 488,000,000 |  | 676,100,000 |
Expected remaining term |  |  |  | 10 months 15 days |  |  |
Principal amount of debt repurchased |  |  |  | $ 146,500,000.0 |  |  |
Repurchase of debt |  |  |  | 162,000,000 |  |  |
Loss on extinguishment of debt |  |  |  | 3,600,000 |  |  |
Amount outstanding |  |  |  | $ 463,500,000 |  | $ 610,000,000 |

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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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