Commitments and Contingencies - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 26, 2015 USD ($) Vendor	Oct. 01, 2015 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 140.4
Minimum
Commitments and Contingencies Disclosure [Line Items]
Company's current brewing and packaging percentage	95.00%
Equipment and machinery
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 29.7
Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 17.6
Number of suppliers | Vendor	2
Hops, Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 54.8
Apples and other ingredients
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	17.7
Glass Bottles
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	2.9
Glass Bottles | Subsequent Event
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments		$ 21.7
Advertising Contracts
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	30.8
Other Commitments
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	4.5
Hops
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 37.2