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Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2019
Jul. 01, 2019
Leases [Abstract]    
Operating lease cost $ 2,293 $ 4,524
Variable lease cost 1,811 2,002
Short-term lease cost $ 230 $ 381