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Marketable Securities (Tables) | 6 Months Ended
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Mar. 28, 2020
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of March 28, 2020 and September 30, 2019 were as follows:
(in thousands) | March 28, 2020
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Commercial paper | $ | 1,482 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,482 |
Corporate notes/bonds | 55,884 |  |  | 85 |  |  | (510 | ) |  | 55,459 |
| $ | 57,366 |  |  | $ | 85 |  |  | $ | (510 | ) |  | $ | 56,941 |
(in thousands) | September 30, 2019
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Commercial paper | $ | 999 |  |  | $ | — |  |  | $ | — |  |  | $ | 999 |
Corporate notes/bonds | 56,318 |  |  | 146 |  |  | (28 | ) |  | 56,436 |
| $ | 57,317 |  |  | $ | 146 |  |  | $ | (28 | ) |  | $ | 57,435 |
Unrealized Gain (Loss) on Investments | The following tables summarize the fair value and gross unrealized losses aggregated by category and the length of time that individual securities have been in a continuous unrealized loss position as of March 28, 2020 and September 30, 2019.
(in thousands) | March 28, 2020
| Less than twelve months |  | Greater than twelve months |  | Total
| Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss
Corporate notes/bonds | $ | 44,598 |  |  | $ | (510 | ) |  | $ | — |  |  | $ | — |  |  | $ | 44,598 |  |  | $ | (510 | )
(in thousands) | September 30, 2019
| Less than twelve months |  | Greater than twelve months |  | Total
| Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss
Corporate notes/bonds | $ | 12,419 |  |  | $ | (14 | ) |  | $ | 16,369 |  |  | $ | (14 | ) |  | $ | 28,788 |  |  | $ | (28 | )
Investments Classified by Contractual Maturity Date | The following table presents our marketable securities by contractual maturity date as of March 28, 2020 and September 30, 2019.
(in thousands) | March 28, 2020 |  | September 30, 2019
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
Due in one year or less | $ | 34,305 |  |  | $ | 34,135 |  |  | $ | 27,725 |  |  | $ | 27,735 |
Due after one year through three years | 23,061 |  |  | 22,806 |  |  | 29,592 |  |  | 29,700 |
| $ | 57,366 |  |  | $ | 56,941 |  |  | $ | 57,317 |  |  | $ | 57,435 |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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