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Debt (2019 Notes) (Details) - USD ($) $ in Thousands | 4 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2016 | Dec. 30, 2016 | Dec. 29, 2017 | Jul. 31, 2016 | Jan. 01, 2016
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of debt converted |  | $ 189,122 | $ 0 |  |
Issuance of common stock in settlement of convertible notes |  | 253,080 |  |  |
Senior subordinated notes [Member] | 2019 Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount of debt converted |  |  |  | $ 287,500 |
Number of shares issued pursuant to conversion (in shares) | 54,009,279 |  |  |  |
Redemption of convertible debt | $ 600 |  |  |  |
Inducements in conversion | 6,000 |  |  |  |
Cash inducements | 2,400 | 2,394 |  |  |
Repayments of interest required upon a conversion under the terms of the indenture that were not repaid under the terms of the exchange agreements | 3,600 | $ 3,572 |  |  |
Issuance of common stock in settlement of convertible notes | 592,700 |  |  |  |
Reduction of additional paid-in capital resulting from conversion | $ 342,700 |  |  |  |
Stated interest rate |  |  |  |  | 4.25%

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