Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 29, 2019 USD ($) vendor
Commitments and Contingencies Disclosure [Line Items]
Contractual obligations	$ 161.9
Machinery and Equipment [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual obligations	$ 38.4
Minimum
Commitments and Contingencies Disclosure [Line Items]
Company's current brewing and packaging percentage	75.00%
Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Number of suppliers | vendor	3
Purchase commitments outstanding	$ 12.3
Hops
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	36.3
Hops | Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Contractual obligations	48.6
Advertising contract [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual obligations	45.2
Other Ingredients [Member]
Commitments and Contingencies Disclosure [Line Items]
Contractual obligations	13.3
Other Commitments
Commitments and Contingencies Disclosure [Line Items]
Contractual obligations	$ 16.4