Computation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended											12 Months Ended
	Dec. 31, 2011		Sep. 24, 2011	Jun. 25, 2011		Mar. 26, 2011	Dec. 25, 2010		Sep. 25, 2010	Jun. 26, 2010	Mar. 27, 2010	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income	$ 17,785	[1]	$ 16,296	$ 28,019	[2]	$ 3,959	$ 12,166	[3]	$ 15,446	$ 16,270	$ 6,260	$ 66,059	$ 50,142	$ 31,118
Dilutive potential common shares												729	568	297
Shares used in net income per common share - diluted												13,741	14,228	14,356
Net income per common share - basic	$ 1.41	[1]	$ 1.26	$ 2.12	[2]	$ 0.30	$ 0.92	[3]	$ 1.14	$ 1.18	$ 0.45	$ 5.08	$ 3.67	$ 2.21
Net income per common share - diluted	$ 1.33	[1]	$ 1.19	$ 2.01	[2]	$ 0.28	$ 0.87	[3]	$ 1.09	$ 1.13	$ 0.44	$ 4.81	$ 3.52	$ 2.17
Shares used in net income per common share - basic												13,012	13,660	14,059
Employee Stock Option
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Effect of dilutive securities												678	514	275
Restricted Stock Awards
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Effect of dilutive securities												51	54	22
Common Class A
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Shares used in net income per common share - basic												8,905	9,553	9,952
Common Class B
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Shares used in net income per common share - basic												4,107	4,107	4,107

[1] 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.

[2] 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.

[3] During the fourth quarter of 2010, the Company recorded a $2.1 million decrease in its liability for refundable deposits for lost kegs and pallets.