Debt - Narrative (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 25, 2012	Mar. 27, 2011	Dec. 26, 2010 Contract	Dec. 25, 2011
Debt Instrument [Line Items]
Revolving line of credit	$ 50,000,000			$ 51,500,000
Number of interest rate derivatives held			2
Interest rate swap agreement, expiration date			Jan. 31, 2011
Weighted average interest rate for credit facility borrowings, including the impact of interest rate swaps	1.30%	3.30%
Interest paid	249,000	878,000
Interest rate swap liabilities	118,000
Portion of interest rate swap liability that would be reclassified into earnings during the next twelve months	83,000
0.53% Interest Rate Swap Agreement [Member]
Debt Instrument [Line Items]
Derivative, fixed interest rate	0.53%
Floating rate debt	50,000,000
Number of interest rate derivatives held	1
Interest rate swap agreement, initiation date	Aug. 30, 2011
Interest rate swap agreement, expiration date	Aug. 30, 2013
4.98% Interest Rate Swap Agreement [Member]
Debt Instrument [Line Items]
Derivative, fixed interest rate			4.98%
Floating rate debt			50,000,000
3.74% Interest Rate Swap Agreement [Member]
Debt Instrument [Line Items]
Derivative, fixed interest rate			3.74%
Floating rate debt			50,000,000
Amended Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	175,000,000
Line of credit facility, term	5 years
Interest margin rate on debt, minimum	0.75%
Interest margin rate on debt, maximum	1.50%
Line of credit facility initiation date	Nov. 30, 2011
Line of credit facility, maturity date	Nov. 30, 2016
Line of credit facility, remaining borrowing capacity, after reduction for outstanding letters of credit	111,500,000
New Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			175,000,000
Line of credit facility, term			5 years
Interest margin rate on debt, minimum			1.00%
Interest margin rate on debt, maximum			1.75%
Line of credit facility initiation date			Sep. 02, 2010