Convertible Notes, Long-Term Debt and Credit Facility - Credit Facility (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 28, 2012
Line of Credit Facility [Line Items]
Credit facility, financial convenant debt ratio, upper range	110.00%
Credit facility, financial convenant debt ratio, lower range	100.00%
Credit facility, covenant terms	The Credit Facility is secured by substantially all of the Company’s domestic personal property, including accounts receivable, inventory, equipment and other intangible assets. The Credit Facility contains customary representations, warranties, and both affirmative and negative covenants, including a financial covenant to maintain consolidated earnings before interest, taxes, depreciation and amortization (“EBITDA”) to debt ratio of 1.10to 1.00 and an annual limit on capital expenditures. The Credit Facility restricts the payment of cash dividends on common stock. In the event of default, the Lender may accelerate the maturity date of any outstanding amounts borrowed under the Credit Facility.
Credit facility, interest rate description	Interest on borrowings under the Credit Facility is calculated daily at the higher of (a) the commercial lending base rate of PNC Bank plus 1%, (b) the federal funds open rate plus 1.5%, and (c) the daily one-month LIBOR rate plus 2%. The interest rate on borrowings would have been 4.25% at September 30, 2012. The Company may elect to borrow any amount available under the Credit Facility for a term of one, two or three months at LIBOR plus 2%
Line of Credit [Member]
Line of Credit Facility [Line Items]
Annual limit on capital expenditures	$ 24
Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	50
Amount borrowed	0.8
Credit facility, commitment fee percentage	0.25%
Credit facility, interest rate at period end	4.25%
Credit facility, secured amount	49.6
Line of Credit [Member] | Term loan [Member]
Line of Credit Facility [Line Items]
Amount borrowed		25.0
Monthly principal payments	0.3
Letter of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity	10
PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Base lending rate	3.25%
PNC Bank Base Rate [Member] | Line of Credit [Member] | Term loan [Member]
Line of Credit Facility [Line Items]
Amount borrowed	4.4
Credit facility, interest rate at period end	4.75%
London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Term loan [Member]
Line of Credit Facility [Line Items]
Amount borrowed	$ 20.0
Credit facility, interest rate at period end	2.70%
Minimum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	1.00%
Minimum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Term loan [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	1.50%
Minimum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	2.00%
Minimum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Term loan [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	2.50%
Maximum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	1.50%
Maximum [Member] | PNC Bank Base Rate [Member] | Line of Credit [Member] | Term loan [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	2.00%
Maximum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	2.50%
Maximum [Member] | London Interbank Lending Rate (LIBOR) [Member] | Line of Credit [Member] | Term loan [Member]
Line of Credit Facility [Line Items]
Credit facility, variable percentage rate spread	3.00%