Commitments and Contingencies - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Product	Apr. 01, 2018 Product	Dec. 30, 2018 USD ($)
Loss Contingencies [Line Items]
Letters of credit totaled	$ 35,600,000		$ 35,600,000
Long-term marketing contractual arrangements	$ 171,900,000
Southeastern [Member]
Loss Contingencies [Line Items]
Purchase requirements of plastic bottles	80.00%
SAC [Member]
Loss Contingencies [Line Items]
Cases of finished product obligated to purchase on an annual basis | Product	17,500,000
Purchased number of cases finished product from SAC | Product	6,800,000	7,200,000
Debt guarantee for related party	$ 23,900,000		23,900,000
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