Computation of Diluted Net Income Per Share (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, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - basic												$ 59,467	$ 66,059	$ 50,142
Add: effect of dilutive potential common shares
Net income per common share - diluted												13,435	13,741	14,228
As reported - basic	$ 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
Net income per common share - diluted	$ 1.25	[1]	$ 1.53	$ 1.06	$ 0.56	$ 1.33	[2]	$ 1.19	$ 2.01	[3]	$ 0.28	$ 4.39	$ 4.81	$ 3.52
Common Class A
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
As reported - basic												40,009	45,209	35,066
Add: effect of dilutive potential common shares
Class B Common Stock												18,913	20,850	15,076
Net effect of unvested participating shares												26
Net income per common share - diluted												$ 58,948	$ 66,059	$ 50,142
As reported - basic												8,689	8,905	9,553
Add: effect of dilutive potential common shares
Share-based awards												639	729	568
Class B Common Stock												4,107	4,107	4,107
Net income per common share - diluted												13,435	13,741	14,228
As reported - basic												$ 4.60	$ 5.08	$ 3.67
Net income per common share - diluted												$ 4.39	$ 4.81	$ 3.52

[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.