Debt (Details) (USD $)			12 Months Ended		12 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Dec. 30, 2011 Covenant Period December 30, 2011 [Member]	Dec. 30, 2011 Covenant Period March 30, 2012 [Member]	Dec. 30, 2011 Covenant Period Six months ended December 28, 2012 [Member]	Dec. 30, 2011 Covenant Period Six months ended June 29, 2012 [Member]	Dec. 30, 2011 Total Debt to EBITDA Ratio Less Than 4.00 [Member]	Dec. 30, 2011 Senior Revolving Credit Facility [Member]	Dec. 25, 2009 Senior Revolving Credit Facility [Member]	Dec. 30, 2011 Senior Revolving Credit Facility [Member] Covenant Period March 30, 2012 [Member]	Dec. 30, 2011 Senior Revolving Credit Facility [Member] Total Debt to EBITDA Ratio Less Than 5.00 [Member]	Dec. 30, 2011 Senior Revolving Credit Facility [Member] Total Debt to EBITDA Ratio Greater Than 5.00 [Member]	Dec. 30, 2011 Senior Revolving Credit Facility [Member] Total Debt to EBITDA Ratio Less Than 1.50 [Member]	Dec. 30, 2011 Senior Revolving Credit Facility [Member] Total Debt to EBITDA Ratio Less Than 2.25 [Member]	Dec. 30, 2011 Senior Revolving Credit Facility [Member] Total Debt to EBITDA Ratio Less Than 3.00 [Member]	Dec. 30, 2011 Fixed-rate (7.0%) Unsecured Convertible Notes Due 2014 [Member]	Dec. 30, 2011 Variable-rate (3.49%) Unsecured Debt in Denmark Due 2013 [Member]	Dec. 30, 2011 Variable-rate (3.48%) Unsecured Debt in Denmark Due 2013 [Member]
Debt Instrument [Line Items]
Convertible senior notes																$ 50,000,000
Maturity date								Feb. 28, 2013								Dec. 15, 2014	Dec. 15, 2014	Feb. 28, 2013
Coupon rate on senior notes (in hundredths)																7.00%
Interest expense																3,500,000
Debt issuance costs								1,400,000	6,300,000							2,500,000
Convertible notes , Latest Date																Dec. 14, 2014
Principal amount																1,000
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
Repurchase price as a percentage of principal amount of notes being purchased ( in hundredths)																100.00%
Long-term Debt	93,950,000	82,150,000															50,000,000	43,950,000
Line of Credit Facility [Line Items]
Borrowings available								55,000,000
Letters of credit , aggregate amount								1,000,000
Prior borrowing capacity								100,000,000		60,800,000
Reduced borrowing capacity								70,000,000
Borrowings outstanding	43,950,000	32,150,000						44,000,000
Credit facility, remaining borrowing capacity								16,800,000
Weighted-average interest rate, minimum (in hundredths)								2.70%
Weighted-average interest rate, maximum (in hundredths)								2.80%
Debt issuance costs capitalized								1,200,000	5,100,000
Debt issuance costs allocated to discontinued operations									4,700,000
Commitment fee percentage (in hundredths)							0.50%				0.50%	0.50%	0.40%	0.40%	0.45%
Credit margin spread (in hundredths)							10.00%				4.25%	4.50%	3.25%	3.50%	3.75%
Fixed charges covenant - EBITDA to total fixed charges			0.75
Leverage covenant			6.00
Minimum six month rolling EBITDA covenant			8,250,000
Six month capital expenditure level covenant			13,500,000		6,500,000	7,000,000
Compensating cash balance requirement	5,800,000
Required level of unrestricted cash				1,000,000
Capital expenditure level			13,500,000		6,500,000	7,000,000
Maturities of Long-Term Debt [Abstract]
2012	0
2013	43,950,000
2014	50,000,000
2015	0
2016	0
Thereafter	$ 0