Commitments and Contingencies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($) Product	Jan. 01, 2017 USD ($) Product	Jan. 03, 2016 USD ($) Product
Loss Contingencies [Line Items]
Rental expense for noncancellable operating leases	$ 18,700,000	$ 13,600,000	$ 8,900,000
Letters of credit totaled	35,600,000	29,700,000
Long-term marketing contractual arrangements	132,800,000
SAC [Member]
Loss Contingencies [Line Items]
Proceeds from management fees received from SAC	$ 9,100,000	$ 9,000,000	$ 8,500,000
Cases of finished product obligated to purchase on an annual basis | Product	17,500,000
Purchased number of cases finished product from SAC | Product	29,900,000	29,900,000	28,300,000
Debt guarantee for related party	$ 23,900,000	$ 23,300,000
Guaranteed portion of SAC's and Southeastern's debt, collateral held	The Company holds no assets as collateral against the SAC guarantee
Impairment of investments	$ 0	$ 0	$ 0
Southeastern [Member]
Loss Contingencies [Line Items]
Purchase requirements of plastic bottles	80.00%
Effective date of debt guarantee for related party eliminated	Nov. 17, 2017