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Debt (Term Loan Payable) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 29, 2017 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Term loan payable |  |  |  |
Accrued and unpaid interest |  | $ 20,460 | $ 21,044 | $ 19,822
Silicon Valley Bank Loan And Security Agreement [Member] |  |  |  |
Term loan payable |  |  |  |
Compensating balance |  |  | $ 81,600 |
Term loans payable [Member] | Silicon Valley Bank Loan And Security Agreement [Member] |  |  |  |
Term loan payable |  |  |  |
Extinguishment of debt amount | $ 80,000 |  |  |
Accrued and unpaid interest | $ 100 |  |  |
Stated interest rate |  |  | 1.00% |

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