Computation of Earnings Per Share, Basic (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 29, 2012		Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 24, 2011	Jun. 25, 2011		Mar. 26, 2011	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income	$ 16,873	[1]	$ 20,750	$ 14,351	$ 7,493	$ 17,785	[2]	$ 16,296	$ 28,019	[3]	$ 3,959	$ 59,467	$ 66,059	$ 50,142
Allocation of net income for basic:
Allocation of net income for basic unvested participating shares												545
Allocation of net income for basic common stock												59,467	66,059	50,142
Weighted average number of shares for basic:
Weighted average number of shares for basic unvested participating shares												118
Shares used in net income per common share - basic												12,914	13,012	13,660
Net income per share for basic:
Net Income Per Common Stock	$ 1.31	[1]	$ 1.60	$ 1.11	$ 0.59	$ 1.41	[2]	$ 1.26	$ 2.12	[3]	$ 0.30	$ 4.60	$ 5.08	$ 3.67
Common Class A
Allocation of net income for basic:
Allocation of net income for basic common stock												40,009	45,209	35,066
Weighted average number of shares for basic:
Weighted average number of shares for basic common stock												8,689	8,905	9,553
Net income per share for basic:
Net Income Per Common Stock												$ 4.60	$ 5.08	$ 3.67
Common Class B
Allocation of net income for basic:
Allocation of net income for basic common stock												$ 18,913	$ 20,850	$ 15,076
Weighted average number of shares for basic:
Weighted average number of shares for basic common stock												4,107	4,107	4,107
Net income per share for basic:
Net Income Per Common Stock												$ 4.60	$ 5.08	$ 3.67

[1] During the fourth quarter of 2012, the Company recorded $3.5 million of promotional expenses as contra revenue which had previously been included in Advertising, promotional and selling expenses.

[2] During the fourth quarter of 2011, the Company recorded a $2.1 million decrease in its tax liabilities as a result of a state tax audit settlement and a $1.5 million decrease in its liability for refundable deposits for lost kegs and pallets.

[3] During the second quarter of 2011, the Company entered into a settlement agreement with its former glass supplier. The Company received a cash payment of $20.5 million which was recorded as an offset to operating expenses.