Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Dec. 25, 2015
Long Term Purchase Commitment [Line Items]
Operating lease expiration period	various dates through 2022
Operating lease rent expense, net	$ 6,900,000	$ 6,300,000	$ 6,800,000
Fair value of earn-out payments related to Miconex acquisition			$ 1,280,000
Loss contingency, expected charge to interest and other income (expense)	1,000,000
Miconex [Member]
Long Term Purchase Commitment [Line Items]
Fair value of earn-out payments related to Miconex acquisition	0	$ 300,000
Inventory [Member]
Long Term Purchase Commitment [Line Items]
Purchase commitments	$ 186,500,000