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Fair Value of Financial Instruments - Activity in Level 3 financial instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities    
Fair value assets reconciliation of changes    
Balance at the beginning of the period $ 5,681 $ 5,196
Gain included in other comprehensive income (loss) 78 485
Balance at the end of the period 5,759 5,681
Recurring | Significant Unobservable Inputs (Level 3) | Contingent Consideration    
Fair value liabilities reconciliation of changes    
Balance at the beginning of the period 0 0
Issues   3,829
Reclassification to acquisition-related liabilities   (3,380)
Gain recognized in selling, general and administrative expenses   449
Balance at the end of the period   0
Convertible Senior Notes    
Fair value liabilities reconciliation of changes    
Fair value of debt $ 419,000 $ 466,200