Commitments and Contingencies - Summary of Company's Purchases from Manufacturing Cooperatives (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 75,881	$ 68,128	$ 143,126	$ 125,098
SAC [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	41,084	40,507	79,160	74,141
Southeastern [Member]
Loss Contingencies [Line Items]
Total purchases from manufacturing cooperatives	$ 34,797	$ 27,621	$ 63,966	$ 50,957