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Financial Instruments | 6 Months Ended
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Mar. 30, 2024
Investments, Debt and Equity Securities [Abstract] |
Financial Instruments | 4. Financial Instruments The Company classifies its marketable securities as available-for-sale and reports them at fair value in the condensed consolidated balance sheets, with unrealized gains and losses recorded in accumulated other comprehensive income (loss). Classification of the Company's marketable securities in the condensed consolidated balance sheets is based on each instrument’s underlying contractual maturity date. Securities with an original maturity of three months or less at time of purchase are recorded in cash and cash equivalents. Securities with an original maturity of greater than three months but less than one year are recorded in marketable securities. As of March 30, 2024, the Company held no securities with original maturities exceeding one year. Realized gains and losses on the sale of securities are recorded in other income (expense), net in the condensed consolidated statements of operations and comprehensive income (loss). The following is a summary of marketable securities as of March 30, 2024 (in thousands):
|  | March 30, 2024
|  | Amortized Cost |  | Unrealized Gain |  | Unrealized Loss |  | Estimated Fair Value
Marketable securities: |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 50,371 |  |  | $ | 1 |  |  | $ | (27) |  |  | $ | 50,345 |
Total marketable securities |  | $ | 50,371 |  |  | $ | 1 |  |  | $ | (27) |  |  | $ | 50,345 |
Reported in: |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  | $ | 4,747 |
Marketable securities |  |  |  |  |  |  |  | 45,598 |
Total |  |  |  |  |  |  |  | $ | 50,345 |
The Company held no marketable securities as of September 30, 2023. There were no realized gains or losses on sales of marketable securities during the three and six months ended March 30, 2024. For securities in an unrealized loss position, the Company evaluated whether the decline in fair value resulted from credit losses or other factors and concluded these amounts were related to temporary fluctuations in value of the securities and were due primarily to changes in interest rates and market conditions of the underlying securities. The Company does not intend to sell the securities, and it is more-likely-than-not that it will not be required to sell before recovery of their amortized cost basis. Accordingly, an allowance for credit losses was deemed unnecessary for these securities as of March 30, 2024. The Company has elected the practical expedient to exclude the applicable accrued interest from both the fair value and the amortized cost basis of its marketable securities for purposes of identifying and measuring impairment. The Company presents accrued interest receivable related to its marketable securities in prepaid and other current assets, separate from marketable securities, on its condensed consolidated balance sheets. Accrued interest receivable related to our marketable securities was immaterial as of March 30, 2024. The Company's accounting policy is to not measure an allowance for credit losses for accrued interest receivable and to write-off any uncollectible accrued interest receivable as a reversal of interest income in a timely manner, which it considers to be in the period in which it determines the accrued interest will not be collected. No accrued interest receivables were written off during the three and six months ended March 30, 2024.

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