Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 30, 2017
Payables and Accruals [Abstract]
Accrued salaries and related expenses	$ 16,166	$ 18,094
Sales tax payable and related expenses	7,523	7,088
Deferred sales	5,736	5,710
Other accrued expenses	29,986	31,753
Accrued expenses and other current liabilities	$ 59,411	$ 62,645