Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 28, 2015 Vendor
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 154.6
Minimum
Commitments and Contingencies Disclosure [Line Items]
Company's current brewing and packaging percentage	95.00%
Machinery and plant equipment
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	19.8
Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	28.9
Number of suppliers	2
Hops, Barley and Wheat
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	62.1
Apples and other ingredients
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	26.9
Glass Bottles
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	17.0
Advertising Contracts
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	24.4
Other Commitments
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	4.4
Hops
Commitments and Contingencies Disclosure [Line Items]
Purchase commitments	$ 33.2