Debt (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 29, 2013	Dec. 28, 2012
Debt Instrument [Line Items]
Long-term debt, net of discount	$ 102,196,000	$ 96,753,000
Warrants issued to purchase common stock (in hundredths)		19.90%
Maximum capital expenditures in 2013	10,000,000
Maximum capital expenditures in 2014	12,000,000
Maximum capital expenditures in 2015, and each fiscal year thereafter	14,000,000
Term loan commitment under a letter of agreement	23,000,000
Secured leverage and net debt leverage ratio requirements [Abstract]
Secured leverage ratio	13.00
Total net debt leverage ratio	14.00
Percentage of preferred stock (in hundredths)	0.679
Preferred stock conversion ratio adjustment fair value	5,800,000
Oaktree Term Loans [Member]
Debt Instrument [Line Items]
Long-term debt, gross amount	107,799,000	103,514,000
Less: Oaktree term loan discount	(27,918,000)	(29,076,000)
Senior convertible notes exchange for term B loan		28,500,000
Oaktree term loans increased during period	4,300,000
Common stock issued (in shares)		36,700,000
Preferred stock issued (in shares)	1,000
Oaktree Term A Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross amount		75,000,000
Coupon rate on senior notes (in hundredths)	12.00%
Oaktree Term B Loan [Member]
Debt Instrument [Line Items]
Long-term debt, gross amount		28,500,000
Coupon rate on senior notes (in hundredths)	10.00%
Senior Convertible Notes [Abstract]
Maximum percentage of par amount (in hundredths)	80.00%
Percentage reduction of principal amount of Term B Loan (in hundredths)	20.00%
Senior Convertible Notes [Member]
Debt Instrument [Line Items]
Long-term debt, gross amount	22,315,000	22,315,000
Coupon rate on senior notes (in hundredths)	7.00%
Senior Convertible Notes [Abstract]
Maturity date	Dec. 15, 2014
Frequency of periodic payment	semi-annually in arrears on June 15 and December 15 of each year
Base amount consider for each convertible debt instrument	$ 1,000
Repurchase price as a percentage of principal amount of notes being purchased ( in hundredths)	100.00%
Percentage of outstanding senior notes holders (in hundredths)	90.00%