Commitments and Contingencies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 25, 2016 USD ($) Vendor
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	$ 190.4
Operating Leases
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	16.7
Equipment and machinery
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	$ 20.0
Minimum
Commitments and Contingencies Disclosure [Line Items]
Company's current brewing and packaging percentage	95.00%
Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 22.2
Number of suppliers | Vendor	2
Hops
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 68.0
Glass Bottles
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	11.6
Purchase commitments	11.6
Hops, Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	90.2
Apples and other ingredients
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	35.2
Advertising Contracts
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	11.4
Other Commitments
Commitments and Contingencies Disclosure [Line Items]
Contract obligations	$ 5.3