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Selected Balance Sheet and Statement of Operations Information - Cash, cash equivalents and restricted cash (Details) - USD ($) $ in Thousands	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023	Sep. 25, 2022
Restricted Cash and Cash Equivalent [Abstract]
Cash and cash equivalents	$ 405	$ 3,219	$ 3,514
Restricted cash included in other current assets	3,302	9,355
Restricted cash included in other assets (noncurrent)	8,064	7,940
Total cash, cash equivalents, and restricted cash shown on the consolidated statements of cash flows	$ 11,771	$ 20,514	$ 14,074	$ 4,100

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- Definition

Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; including, but not limited to, discontinued operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate.

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Amount of current assets that are pledged or subject to withdrawal restrictions, classified as other.

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Amount of noncurrent assets that are pledged or subject to withdrawal restrictions, classified as other.

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