Debt - Additional Information (Detail) (USD $)	12 Months Ended	6 Months Ended
	Dec. 29, 2012	Jun. 30, 2012 Commonwealth of Pennsylvania	Dec. 29, 2012 Alternative Prime Rate	Dec. 29, 2012 LIBOR rate
Debt Instrument [Line Items]
Line of credit, current borrowing capacity	$ 50,000,000
Line of credit, expiration date	Mar. 31, 2015
Debt interest rate at end of period			3.25%	0.21%
Basis spread on variable rate	0.45%
Commitment fee	0.15%
Debt, covenant compliance	The Company was in compliance with all covenants as of December 29, 2012 and December 31, 2011.
Grant received		770,000
Contract period		10 years
Amount of term note with bank	628,000
Maturity date of note	Dec. 31, 2021
Fixed interest rate	4.25%
Note, Annual payments	77,000
CD held by bank to secure term note	$ 628,000