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Debt - Additional Information (Details) - Convertible Notes - USD ($) |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
May 29, 2018 | Mar. 03, 2017 | Mar. 22, 2017 | Dec. 28, 2019 | Jun. 29, 2019
1.75% Senior Convertible Notes |  |  |  |  |
Debt details |  |  |  |  |
Interest rate on senior convertible notes | 1.75% |  |  | 1.75% |
Aggregate principal amount of convertible debt | $ 225,000,000.0 |  |  |  |
Proceeds from convertible debt | $ 69,500,000 |  |  |  |
Effective discount rate | 5.30% |  |  |  |
Derivative, term of contract | 5 years |  |  |  |
Expected remaining term |  |  |  | 3 years 4 months 24 days |
Proceeds from debt, net of issuance costs | $ 67,300,000 |  |  |  |
Fair market value of convertible debt |  |  |  | $ 282,500,000 | $ 261,300,000
1.75% Senior Convertible Notes | Exchange Transaction |  |  |  |  |
Debt details |  |  |  |  |
Debt issued | 155,500,000 |  |  |  |
Repayments of debt | $ 151,500,000 |  |  |  |
1.00% Senior Convertible Notes |  |  |  |  |
Debt details |  |  |  |  |
Interest rate on senior convertible notes |  |  |  | 1.00% |
Aggregate principal amount of convertible debt |  | $ 400,000,000.0 | $ 60,000,000.0 |  |
Effective discount rate |  | 4.80% |  |  |
Derivative, term of contract |  | 7 years |  |  |
Expected remaining term |  |  |  | 4 years 2 months 12 days |
Proceeds from debt, net of issuance costs |  |  | $ 451,100,000 |  |
Fair market value of convertible debt |  |  |  | $ 596,300,000 | $ 540,800,000

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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