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Marketable Securities (Tables) | 9 Months Ended
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Jun. 29, 2019
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of June 29, 2019 and September 30, 2018 were as follows:
| June 29, 2019
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Commercial paper | $ | 4,474 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 4,475 |
Corporate notes/bonds | 50,087 |  |  | 123 |  |  | (59 | ) |  | 50,151 |
| $ | 54,561 |  |  | $ | 124 |  |  | $ | (59 | ) |  | $ | 54,626 |
| September 30, 2018
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 220 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 219 |
Corporate notes/bonds | 55,140 |  |  | — |  |  | (403 | ) |  | 54,737 |
U.S. government agency securities | 1,004 |  |  | — |  |  | (9 | ) |  | 995 |
| $ | 56,364 |  |  | $ | — |  |  | $ | (413 | ) |  | $ | 55,951 |
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 June 29, 2019 and September 30, 2018.
| June 29, 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
| (in thousands)
Corporate notes/bonds | $ | 3,519 |  |  | $ | (6 | ) |  | $ | 24,398 |  |  | $ | (53 | ) |  | $ | 27,917 |  |  | $ | (59 | )
| $ | 3,519 |  |  | $ | (6 | ) |  | $ | 24,398 |  |  | $ | (53 | ) |  | $ | 27,917 |  |  | $ | (59 | )
| September 30, 2018
| Less than twelve months |  | Greater than twelve months |  | Total
| Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss |  | Fair Value |  | Gross unrealized loss
| (in thousands)
Certificates of deposit | $ | 219 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 219 |  |  | $ | (1 | )
Corporate notes/bonds | 24,067 |  |  | (70 | ) |  | 30,670 |  |  | (333 | ) |  | 54,737 |  |  | (403 | )
U.S. government agency securities | — |  |  | — |  |  | 995 |  |  | (9 | ) |  | 995 |  |  | (9 | )
| $ | 24,286 |  |  | $ | (71 | ) |  | $ | 31,665 |  |  | $ | (342 | ) |  | $ | 55,951 |  |  | $ | (413 | )
Investments Classified by Contractual Maturity Date | The following table presents our marketable securities by contractual maturity date as of June 29, 2019 and September 30, 2018.
| June 29, 2019 |  | September 30, 2018
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands)
Due in one year or less | $ | 32,977 |  |  | $ | 32,947 |  |  | $ | 25,792 |  |  | $ | 25,670 |
Due after one year through three years | 21,584 |  |  | 21,679 |  |  | 30,572 |  |  | 30,281 |
| $ | 54,561 |  |  | $ | 54,626 |  |  | $ | 56,364 |  |  | $ | 55,951 |

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