Debt and Capital Lease Obligations - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended			6 Months Ended
	Oct. 31, 2012	Mar. 30, 2013	Dec. 29, 2012	Oct. 31, 2012 Property Plant and Equipment	Jun. 30, 2012 Commonwealth of Pennsylvania
Debt and Capital Lease Obligations [Line Items]
Line of credit, current borrowing capacity		$ 50,000,000
Line of credit, expiration date		Mar. 31, 2015
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		566,000
Notes payable		566,000	628,000
Amount recorded as capital lease		744,000	566,000	775,000
Capital lease obligation		231,000
Payment made for lease		$ 544,000
Capital lease, commencement date	Jan. 04, 2013