Long-Term Obligations and Credit Arrangements, Preferred Stock (Details) (USD $)	3 Months Ended		9 Months Ended													9 Months Ended						9 Months Ended		9 Months Ended		25 Months Ended					3 Months Ended	9 Months Ended				9 Months Ended												9 Months Ended												9 Months Ended				9 Months Ended		9 Months Ended
	Nov. 23, 2012	Nov. 25, 2011	Nov. 23, 2012	Nov. 25, 2011	Sep. 28, 2012	Feb. 24, 2012	Nov. 23, 2012 Notes Payable to Banks [Member]	Feb. 24, 2012 Notes Payable to Banks [Member]	Nov. 23, 2012 Equipment lease [Member]	Feb. 24, 2012 Equipment lease [Member]	Nov. 23, 2012 Term Loan [Member]	Feb. 24, 2012 Term Loan [Member]	Sep. 28, 2012 Maximum [Member]	Sep. 28, 2012 Minimum [Member]	Nov. 23, 2012 Libor [Member]	Nov. 23, 2012 PNC Credit Facility [Member]	Nov. 23, 2012 Dedicated Line of Credit with PNC Bank [Member]	Nov. 23, 2012 ETC-PZL Line of Credit Agreement [Member]	Nov. 23, 2012 Subordinated convertible promissory note [Member]	Nov. 23, 2012 Interest Rate Swap [Member]	Sep. 28, 2012 Interest Rate Swap [Member]	Nov. 23, 2012 Line of Credit Note [Member]	Nov. 23, 2012 ETC and PNC Bank Loan Agreement [Member]	Nov. 23, 2012 Lenfest [Member]	Nov. 23, 2012 Lenfest [Member] Lenfest Credit Facility [Member]	Sep. 28, 2012 Lenfest [Member] Lenfest Credit Facility [Member]	Apr. 24, 2009 Lenfest [Member] Lenfest Credit Facility [Member]	Apr. 24, 2009 Lenfest [Member] 2007 PNC Credit Facility [Member]	Nov. 23, 2012 Lenfest [Member] PNC Credit Facility [Member]	Oct. 06, 2010 Lenfest [Member] PNC Credit Facility [Member]	Nov. 23, 2012 PNC Bank [Member]	Nov. 23, 2012 PNC Bank [Member]	Sep. 28, 2012 PNC Bank [Member] Libor [Member]	Apr. 24, 2009 PNC Bank [Member] 2007 PNC Credit Facility [Member]	Apr. 23, 2009 PNC Bank [Member] 2007 PNC Credit Facility [Member]	Nov. 23, 2012 PNC Bank [Member] Term Loan [Member]	Sep. 28, 2012 PNC Bank [Member] Term Loan [Member] Libor [Member] Maximum [Member]	Sep. 28, 2012 PNC Bank [Member] Term Loan [Member] Libor [Member] Minimum [Member]	Nov. 23, 2012 PNC Bank [Member] Term Loan [Member] Libor [Member] Current [Member]	Nov. 23, 2012 PNC Bank [Member] Line of Credit Note [Member]	Sep. 28, 2012 PNC Bank [Member] Line of Credit Note [Member]	Sep. 28, 2012 PNC Bank [Member] Line of Credit Note [Member] Libor [Member] Maximum [Member]	Sep. 28, 2012 PNC Bank [Member] Line of Credit Note [Member] Libor [Member] Minimum [Member]	Nov. 23, 2012 PNC Bank [Member] Line of Credit Note [Member] Libor [Member] Current [Member]	Sep. 28, 2012 PNC Bank [Member] Line of Credit Note [Member] Base Rate [Member] Maximum [Member]	Sep. 28, 2012 PNC Bank [Member] Line of Credit Note [Member] Base Rate [Member] Minimum [Member]	Nov. 23, 2012 PNC Bank [Member] Line of Credit Note [Member] Base Rate [Member] Current [Member]	Nov. 23, 2012 Series D Preferred Stock [Member]	Sep. 28, 2012 Series D Preferred Stock [Member]	Feb. 24, 2012 Series D Preferred Stock [Member]	Oct. 06, 2010 Series D Preferred Stock [Member]	Apr. 24, 2009 Series D Preferred Stock [Member] 2007 PNC Credit Facility [Member]	Oct. 06, 2010 Series D Preferred Stock [Member] PNC Credit Facility [Member]	Oct. 06, 2010 Series D Preferred Stock [Member] Lenfest [Member]	Apr. 24, 2009 Series D Preferred Stock [Member] Lenfest [Member]	Sep. 28, 2012 Series D Preferred Stock [Member] Lenfest [Member] Lenfest Credit Facility [Member]	Apr. 24, 2009 Series D Preferred Stock [Member] Lenfest [Member] Lenfest Credit Facility [Member]	Apr. 24, 2009 Series D Preferred Stock [Member] Lenfest [Member] 2007 PNC Credit Facility [Member]	Sep. 28, 2012 Series D Preferred Stock [Member] PNC Bank [Member] PNC Credit Facility [Member]	Nov. 23, 2012 Series E Preferred Stock [Member]	Sep. 28, 2012 Series E Preferred Stock [Member]	Feb. 24, 2012 Series E Preferred Stock [Member]	Jul. 02, 2009 Series E Preferred Stock [Member]	Nov. 23, 2012 Series E Preferred Stock [Member] Lenfest [Member]	Sep. 28, 2012 Series E Preferred Stock [Member] PNC Bank [Member]	Nov. 23, 2012 Series D and Series E Preferred Stock [Member]
Line of Credit Facility [Line Items]
Availability under line of credit																	$ 5,422,000	$ 175,000									$ 7,500,000							$ 20,000,000	$ 15,000,000	$ 15,000,000					$ 15,000,000
Original principal amount of senior subordinated promissory note issued by ETC																			10,000,000
Marketable securities pledged																												10,000,000
Term loan period																																				5 years
Shares repurchased and retired, value																																																																2,000		10,000,000
Number of shares repurchased and retired (in shares)																																																386												9,614				2,000		10,000,000
Preferred Stock, stated value (in dollars per share)	$ 1,000		$ 1,000		$ 1,000																					$ 1,000																									$ 1,000	$ 1,000			$ 1,000	$ 1,000			$ 1,000						$ 1,000	$ 1,000
Repayment of indebtedness with PNC Bank																															5,000,000
Annual Principal Payment																								417,000
Series E Preferred Stock dividend rate (in hundredths)			4.00%																																																															4.00%
Previous series D and series E dividend rate (in hundredths)																																																																		10.00%
Loan Agreement [Abstract]
PNC Libor rate (in hundredths)																																	2.7185%
Basis spread on variable interest rate (in hundredths)	0.74%		0.74%																																		2.75%	2.25%	2.75%			2.75%	2.25%	2.75%	0.25%	(0.25%)	0.25%
PNC base rate (in hundredths)																																	3.00%
Percentage fee for unused fund (in hundredths)																						0.25%
Cash borrowing under line of credit																																								12,985,000
Availability under line of credit																																								1,237,000
Outstanding letters of credit															778,000
Minimum tangible net worth																							15,000,000
Operating leverage ratio (in hundredths)													325.00%	100.00%
Operating leverage ratio first fiscal year (in hundredths)													300.00%	100.00%
Operating leverage ratio second fiscal year (in hundredths)													290.00%	100.00%
Fixed charge coverage ratio (in hundredths)													110.00%	100.00%
Interest Rate Swap [Abstract]
Coverage amount against interest rate fluctation	5,000,000		5,000,000																		5,000,000
Notional amount of interest rate derivative	5,000,000		5,000,000																		5,000,000
Basis point in excess of margin (in hundredth)																					0.74%
Fair value of our interest rate swap as a long-term liability																				28,000
Preferred Stock Repurchase Agreement
Preferred Stock, stated value (in dollars per share)	$ 1,000		$ 1,000		$ 1,000																					$ 1,000																									$ 1,000	$ 1,000			$ 1,000	$ 1,000			$ 1,000						$ 1,000	$ 1,000
Stock Repurchased and Retired During Period, Shares (in shares)																																																386												9,614				2,000		10,000,000
Preferred Stock, shares outstanding (in shares)																																																0		386										12,127		21,741
Certificate of deposit with bank																	5,422,000
Commitment fee (in hundredths)																	3.00%
Preferred Stock [Abstract]
Number of classes of Cumulative Convertible Participating Preferred Stock			2
Preferred Stock, shares authorized (in shares)																																																11,000		11,000										25,000		25,000
Preferred Stock, par value (in dollars per share)	$ 0.05		$ 0.05																																													$ 0.05		$ 0.05										$ 0.05		$ 0.05
Preferred Stock, stated value (in dollars per share)	$ 1,000		$ 1,000		$ 1,000																					$ 1,000																									$ 1,000	$ 1,000			$ 1,000	$ 1,000			$ 1,000						$ 1,000	$ 1,000
Preferred Stock, dividend rate (in hundredths)			4.00%																																																															4.00%
Origination fee, percentage (in hundredths)																																																									1.00%	1.00%
Origination fee, amount																																																									55,000
Origination fee paid (in shares)																																																				100					55	100
Preferred Stock, conversion price (in dollars per share)																														$ 3.02																						$ 1.11					$ 0.94						$ 2.00
Shares issued upon conversion of preferred stock (in shares)	6,063,321		6,063,321																																																	90,090		76,490			58,511			6,063,321			11,870,391
Preferred Stock, shares issued (in shares)																																																					231								9,614		23,741
Preferred Stock, shares outstanding (in shares)																																																0		386										12,127		21,741
Preferred Stock, totaled	12,127,000		12,127,000			22,127,000																																										0	386,000	386,000										12,127,000		21,741,000
Number of days preceding issuance of shares																																																				120 days	120 days
Interest expense, net	319,000	195,000	764,000	552,000																					231,000	417,000
Number of separate agreements into which entity entered to repurchase and retire preferred stock																																																												3
Number of shares repurchased and retired (in shares)																																																386												9,614				2,000		10,000,000
Shares repurchased and retired, value																																																																2,000		10,000,000
Dividends accrued	286,000	552,000	1,390,000	1,656,000																																												13,000												825,000
Common Stock Warrants [Abstract]
Issuance date of debt																								Feb. 28, 2009								Jul. 02, 2009
Amount paid to purchase warrants																								2,000,000
Warrants to purchase common stock (in shares)																450,450								143,885
Amount of guaranteed line of credit																													5,000,000
Value of common stock as percentage of note issued (in hundredths)																10.00%								10.00%
Exercise price of warrants (in dollars per share)																$ 1.11								$ 1.39
Warrants exercisable period (in years)																7 years								7 years
Number of days preceding issuance of warrants (in days)																120 days								120 days
Debt Instrument [Line Items]
Total long-term debt obligations	27,735,000		27,735,000			16,724,000	12,985,000	16,716,000	0	8,000	14,750,000	0
Less: Current portion of long-term debt obligations	(3,000,000)		(3,000,000)			(8,000)
Total long-term debt obligations, less current portion	$ 24,735,000		$ 24,735,000			$ 16,716,000