Debt (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jul. 01, 2011	Jul. 01, 2011
Convertible Debt [Member]
Debt Instrument [Line Items]
Convertible senior notes	$ 50.0	$ 50.0
Maturity date		Dec. 15, 2014
Coupon rate on senior notes (Hundredths)	7.00%	7.00%
Expected interest payment on convertible senior notes		3.5
Convertible notes , Latest Date		2014-12-14
Initial conversion rate for the notes per $1,000 principal amount of notes (in shares)		156.64
Initial conversion price (in dollars per share)	$ 6.38	$ 6.38
Repurchase price as a percentage of principal amount of notes being purchased ( in hundredths)	100.00%	100.00%
Senior Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings available	100.0	100.0
Letters of credit , aggregate amount	10.0	10.0
Borrowings outstanding	42.2	42.2
Weighted-average interest rate (in hundredths)	1.70%	1.70%
Average borrowings outstanding	41.4	41.4
Reduction to the borrowings permitted under the credit facility	from 100.0 million to 70.0 million	from 100.0 million to 70.0 million
Total fees paid	1.2	1.2
Commitment fees range , lower (in hundredths)		0.40%
Commitment fees range, Upper (in hundredths)		0.50%
Credit margin spread , Lower (in hundredths)		3.25%
Credit margin spread, Upper (in hundredths)		4.50%
Agreement to maintain unrestricted cash	15	15
Senior Revolving Credit Facility [Member] | Total Debt to EBITDA Ratio Less Than 1.50 [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.40%
Credit margin spread		3.25%
Senior Revolving Credit Facility [Member] | Total Debt to EBITDA Ratio Less Than 2.25 [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.40%
Credit margin spread		3.50%
Senior Revolving Credit Facility [Member] | Total Debt to EBITDA Ratio Less Than 3.00 [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.45%
Credit margin spread		3.75%
Senior Revolving Credit Facility [Member] | Total Debt to EBITDA Ratio Less Than 4.00 [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.50%
Credit margin spread		4.00%
Senior Revolving Credit Facility [Member] | Total Debt to EBITDA Ratio Less Than 5.00 [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.50%
Credit margin spread		4.25%
Senior Revolving Credit Facility [Member] | Greater Than 5.00 [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage		0.50%
Credit margin spread		4.50%
Senior Revolving Credit Facility [Member] | Covenant Period September 30, 2011 [Member]
Line of Credit Facility [Line Items]
Minimum EBITDA fixed charges (times fixed charges)	1.10	1.10
Maximum debt outstanding (times EBITDA)	3.75	3.75
Minimum six month rolling EBITDA	6.00	6.00
Senior Revolving Credit Facility [Member] | Covenant Period December 30, 2011 [Member]
Line of Credit Facility [Line Items]
Minimum EBITDA fixed charges (times fixed charges)	0.75	0.75
Maximum debt outstanding (times EBITDA)	6.00	6.00
Minimum six month rolling EBITDA	8.25	8.25
Senior Revolving Credit Facility [Member] | Covenant Period March 30, 2012 [Member]
Line of Credit Facility [Line Items]
Minimum EBITDA fixed charges (times fixed charges)	1.10	1.10
Maximum debt outstanding (times EBITDA)	3.50	3.50
Minimum six month rolling EBITDA	9.50	9.50
Senior Revolving Credit Facility [Member] | Covenant Period June 29, 2012 and thereafter [Member]
Line of Credit Facility [Line Items]
Minimum EBITDA fixed charges (times fixed charges)	1.50	1.50
Senior Revolving Credit Facility [Member] | Covenant Period June 29, 2012 [Member]
Line of Credit Facility [Line Items]
Maximum debt outstanding (times EBITDA)	3.00	3.00
Minimum six month rolling EBITDA	13.50	13.50
Senior Revolving Credit Facility [Member] | Covenant Period September 28, 2012 [Member]
Line of Credit Facility [Line Items]
Maximum debt outstanding (times EBITDA)	2.25	2.25
Minimum six month rolling EBITDA	15.50	15.50
Senior Revolving Credit Facility [Member] | Covenant Period December 28, 2012 [Member]
Line of Credit Facility [Line Items]
Maximum debt outstanding (times EBITDA)	2.00	2.00
Minimum six month rolling EBITDA	15.50	15.50
Senior Revolving Credit Facility [Member] | Covenant Period Six months ended December 30, 2011[Member]
Line of Credit Facility [Line Items]
Maximum capital expenditure	13.5	13.5
Senior Revolving Credit Facility [Member] | Covenant Period Six months ended June 29, 2012 [Member]
Line of Credit Facility [Line Items]
Maximum capital expenditure	8.5	8.5
Senior Revolving Credit Facility [Member] | Covenant Period Six months ended December 28, 2011 [Member]
Line of Credit Facility [Line Items]
Maximum capital expenditure	10.0	10.0
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Borrowings outstanding	$ 1.5	$ 1.5