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Marketable Securities (Tables) | 3 Months Ended
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Dec. 29, 2018
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of December 29, 2018 and September 30, 2018 were as follows:
| December 29, 2018
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 221 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 220 |
Commercial paper | 1,961 |  |  | — |  |  | (5 | ) |  | 1,956 |
Corporate notes/bonds | 52,868 |  |  | 6 |  |  | (394 | ) |  | 52,480 |
U.S. government agency securities | 1,000 |  |  | — |  |  | (5 | ) |  | 995 |
| $ | 56,050 |  |  | $ | 6 |  |  | $ | (405 | ) |  | $ | 55,651 |
| 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 December 29, 2018 and September 30, 2018.
| December 29, 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 | $ | — |  |  | $ | — |  |  | $ | 220 |  |  | $ | (1 | ) |  | $ | 220 |  |  | $ | (1 | )
Commercial paper | 1,956 |  |  | (5 | ) |  | — |  |  | — |  |  | 1,956 |  |  | (5 | )
Corporate notes/bonds | 22,303 |  |  | (119 | ) |  | 27,695 |  |  | (275 | ) |  | 49,998 |  |  | (394 | )
U.S. government agency securities | — |  |  | — |  |  | 995 |  |  | (5 | ) |  | 995 |  |  | (5 | )
| $ | 24,259 |  |  | $ | (124 | ) |  | $ | 28,910 |  |  | $ | (281 | ) |  | $ | 53,169 |  |  | $ | (405 | )
| 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 available-for-sale marketable securities by contractual maturity date as of December 29, 2018 and September 30, 2018.
| December 29, 2018 |  | September 30, 2018
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands) |  | (in thousands)
Due in one year or less | $ | 25,544 |  |  | $ | 25,430 |  |  | $ | 25,792 |  |  | $ | 25,670 |
Due after one year through three years | 30,506 |  |  | 30,221 |  |  | 30,572 |  |  | 30,281 |
| $ | 56,050 |  |  | $ | 55,651 |  |  | $ | 56,364 |  |  | $ | 55,951 |

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