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Marketable Securities | 6 Months Ended
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Mar. 28, 2020
Marketable Securities [Abstract] |
Marketable Securities | 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 |
Our investment portfolio consists of certificates of deposit, commercial paper, corporate notes/bonds and government securities that have a maximum maturity of three years. The longer the duration of these securities, the more susceptible they are to changes in market interest rates and bond yields. All unrealized losses are due to changes in market interest rates, bond yields and/or credit ratings. We review our investments to identify and evaluate investments that have an indication of possible impairment. We concluded that, at March 28, 2020, the unrealized losses were temporary. 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 | )
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 The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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