Credit Line and Notes - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended			3 Months Ended				3 Months Ended	12 Months Ended						1 Months Ended		1 Months Ended
	Aug. 21, 2013	Sep. 28, 2013	Sep. 29, 2012	Jun. 29, 2013	Sep. 28, 2013 7.50 % Exchangeable Senior Secured Second Lien Notes	Sep. 28, 2013 Unamortized debt discount and issuance costs recognized as expense	Sep. 28, 2013 Other Noncurrent Liabilities 7.50 % Exchangeable Senior Secured Second Lien Notes	Jun. 29, 2013 Other Noncurrent Liabilities 7.50 % Exchangeable Senior Secured Second Lien Notes	Sep. 28, 2013 Convertible notes 7.50 % Exchangeable Senior Secured Second Lien Notes	Jun. 29, 2013 Convertible notes 7.50 % Exchangeable Senior Secured Second Lien Notes	Sep. 28, 2013 Term Loans	Jun. 29, 2013 Term Loans	May 06, 2013 Term Loans	May 06, 2013 Senior secured credit facility	May 06, 2013 Senior secured credit facility Before Amendment	May 06, 2013 Senior secured credit facility Eliminated Borrower's option to increase the revolving credit facility	May 06, 2013 Senior secured credit facility Removed Availability Financial Covenant	May 06, 2013 Senior secured credit facility Providing for payments and proceeds of asset sales to be applied to the revolving credit facility and the Term Loan First Payment Wells Fargo Capital Finance, Inc. and Silicon Valley Bank	May 06, 2013 Senior secured credit facility Providing for payments and proceeds of asset sales to be applied to the revolving credit facility and the Term Loan Second Payment	May 06, 2013 Senior secured credit facility Minimum	May 06, 2013 Senior secured credit facility Minimum Removed Availability Financial Covenant
Ceded Credit Risk [Line Items]
Facility size													$ 25,000,000	$ 50,000,000	$ 80,000,000
Increase the revolving credit facility																100,000,000
Amounts outstanding under credit agreement		0		39,964,000							0	25,000,000								10,000,000	15,000,000
Line of credit, financial covenant required qualified cash balances	25,000,000																15,000,000
Proceeds of asset sales to be applied to revolving credit facility and Term Loan																		20,000,000	25,000,000
Credit facility description	(i) extending the date by which the Borrower shall have consummated one or more asset sales with a minimum threshold of net proceeds to September 2, 2013; (ii) eliminating the mandatory reduction of the revolving credit facility upon the consummation of the asset sales described in (i) above; and (iii) adding a covenant that the Borrower is required to maintain a minimum liquidity of at least $45.0 million at all times (liquidity being the sum of the Borrower’s excess availability under the revolving credit facility plus the lesser of $25.0 million and qualified cash balances).
Liquidity under credit facility	45,000,000
Payment of amendment fee to the lenders	650,000
Interest income (expense), net		(553,000)	(478,000)			(4,300,000)
Available amount under the credit agreement		0
Private placement offering					25,000,000
Interest rate of private placement					7.50%
Net proceeds of private placement					22,800,000
Contingent obligation for make-whole premium							700,000	100,000
Debt discount					1,909,000				1,300,000	1,300,000
Debt issuance costs									900,000	900,000
Debt discount and issuance costs recognized									$ 200,000