Convertible Senior Notes - Narrative (Details) - USD ($) $ in Millions |
Jun. 01, 2018 |
Jun. 30, 2018 |
May 31, 2018 |
Dec. 30, 2017 |
Jul. 01, 2017 |
---|---|---|---|---|---|
Long-term debt | Accounting Standards Update 2015-03 | |||||
Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
Debt issuance cost increase (decrease) | $ 2.1 | ||||
1.75% Convertible Senior Notes Due June 1, 2018 | |||||
Accounts, Notes, Loans and Financing Receivable [Line Items] | |||||
Repayment of debt | $ 150.0 | ||||
Repayment of final coupon interest | $ 1.3 | ||||
Net equity component carrying amount | $ 43.3 | ||||
Debt instrument interest percentage | 1.75% | 1.75% | 1.75% | ||
Additional effective rate of interest to be used on amortized carrying value | 10.23% | 10.23% |