Revolving Credit Facilities and Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended		3 Months Ended			3 Months Ended			3 Months Ended		3 Months Ended		3 Months Ended		3 Months Ended
	Dec. 28, 2012	Sep. 28, 2012	Dec. 28, 2012 Minimum	Dec. 28, 2012 Minimum Base rate plus 1.25%	Dec. 28, 2012 Minimum LIBOR rate plus 3.25%	Dec. 28, 2012 Maximum	Dec. 28, 2012 Maximum Base rate plus 1.25%	Dec. 28, 2012 Maximum LIBOR rate plus 3.25%	Dec. 28, 2012 Term Loan Facility	Feb. 06, 2012 Term Loan Facility	Dec. 28, 2012 Revolving Credit Facility	Feb. 06, 2012 Revolving Credit Facility	Dec. 28, 2012 6.75% Convertible Senior Notes D	Sep. 28, 2012 6.75% Convertible Senior Notes	Dec. 28, 2012 Redeem all or any part of convertible notes on or after June 15, 2013 Make-Whole Premium	Dec. 28, 2012 Redeem all or any part of convertible notes on or after June 15, 2013 Make-Whole Premium Minimum	Dec. 28, 2012 6.50% Convertible Senior Notes	Dec. 30, 2011 6.50% Convertible Senior Notes	Sep. 28, 2012 6.50% Convertible Senior Notes	Jul. 30, 2008 3.75% Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument face amount										$ 15,000,000			$ 32,000,000	$ 32,000,000			$ 15,000,000		$ 15,000,000	$ 15,000,000
Net proceeds from offering of debt after deducting discounts													30,600,000
Convertible senior note, percentage													6.75%				6.50%			3.75%
Notes converted, common stock at an initial conversion rate, shares													256.4103
Principal amount per convertible note	$ 1,000
Common stock, par value	$ 0.01	$ 0.01											$ 3.90
Repurchase price, percentage on principal amount, plus accrued and unpaid interest													100.00%
Sale price																$ 3.00
Payment to pay stock holder															97.00%
Trading days prior to notice of conversion													5
Minimum percentage of common stock conversion price resulting in redemption of cash all and full part of notes	150.00%
Financing aggregate principal amount not to exceed													35,000,000
Contingent obligation in other liability													253,000
Estimated Fair Value													40,600,000				15,200,000
Assumed volatility													83.60%				60.60%
Debt Discount rate													9.00%				9.00%
Discount for lack of marketability													10.00%				10.00%
Debt issuance costs	438,000												492,000				537,000
Revolving credit facility											13,500,000	20,000,000
Outstanding balance on the term loan									15,000,000
Term loan, frequency of periodic payment									quarterly
Quarterly principal payments due for each quarter during calendar year 2013									375,000
Quarterly principal payments due for each quarter during calendar year 2014									750,000
Quarterly principal payments due for each quarter during calendar year 2015									1,100,000
Quarterly principal payments due for each quarter during calendar year 2016									1,500,000
Outstanding balance on the revolving credit facility eligible borrowing											13,500,000
Total amount available under the revolving credit facility											20,000,000
Revolving credit facility, minimum borrowing maintenance											8,000,000
Revolving credit facility as long-term liability	8,000,000	8,000,000									8,000,000
Prime rate or LIBOR rate, floor percentage	0.75%
Facility, basis spread on variable rate				1.25%	3.25%		1.75%	3.75%
Revolving credit facility, interest rate	4.25%
Total interest expense incurred on term loan facility and revolving credit facility	306,000												548,000				244,000	245,000
Fee payable, percentage of average daily unused portion of the credit facility			0.25%			0.50%
Debt issuance costs, net of accumulated amortization	422,000
Accrued and unpaid interest																	100,000
Debt exchange, transaction fees																	$ 900,000
Conversion price for notes conversion into common stock																	$ 4.74