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Supplemental Cash Flow Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 29, 2019
Mar. 30, 2018
Cash paid during period:    
Income taxes $ 440 $ 678
Non-cash investing and financing activities:    
Unrealized (loss) gain on short-term investments 154 (40)
Vested stock unit awards issued to settle accrued bonuses 7,947 7,643
Accrual for capital expenditures 1,903 299
Right-of-use asset obtained in exchange for operating lease obligations $ 25,653 $ 0