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Marketable Securities (Tables) | 3 Months Ended
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Dec. 28, 2019
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of December 28, 2019 and September 30, 2019 were as follows:
(in thousands) | December 28, 2019
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
Corporate notes/bonds | 57,369 |  |  | 130 |  |  | (19 | ) |  | 57,480 |
| $ | 57,369 |  |  | $ | 130 |  |  | $ | (19 | ) |  | $ | 57,480 |
(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 December 28, 2019 and September 30, 2019.
(in thousands) | December 28, 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 | $ | 17,718 |  |  | $ | (13 | ) |  | $ | 12,814 |  |  | $ | (6 | ) |  | $ | 30,532 |  |  | $ | (19 | )
(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 December 28, 2019 and September 30, 2019.
(in thousands) | December 28, 2019 |  | September 30, 2019
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
Due in one year or less | $ | 29,035 |  |  | $ | 29,075 |  |  | $ | 27,725 |  |  | $ | 27,735 |
Due after one year through three years | 28,334 |  |  | 28,405 |  |  | 29,592 |  |  | 29,700 |
| $ | 57,369 |  |  | $ | 57,480 |  |  | $ | 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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