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Marketable Securities (Tables) | 3 Months Ended
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Dec. 30, 2017
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of December 30, 2017 and September 30, 2017 were as follows:
| December 30, 2017
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 221 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 220 |
Corporate notes/bonds | 48,268 |  |  | — |  |  | (311 | ) |  | 47,957 |
US government agency securities | 2,401 |  |  | — |  |  | (11 | ) |  | 2,390 |
| $ | 50,890 |  |  | $ | — |  |  | $ | (323 | ) |  | $ | 50,567 |
| September 30, 2017
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 240 |  |  | $ | — |  |  | $ | — |  |  | $ | 240 |
Corporate notes/bonds | 47,811 |  |  | 2 |  |  | (140 | ) |  | 47,673 |
US government agency securities | 2,407 |  |  | — |  |  | (5 | ) |  | 2,402 |
| $ | 50,458 |  |  | $ | 2 |  |  | $ | (145 | ) |  | $ | 50,315 |
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 30, 2017 and September 30, 2017.
| December 30, 2017
| 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 | )
Corporate notes/bonds | 22,673 |  |  | (183 | ) |  | 25,284 |  |  | (128 | ) |  | 47,957 |  |  | (311 | )
US government agency securities | — |  |  | — |  |  | 2,390 |  |  | (11 | ) |  | 2,390 |  |  | (11 | )
| $ | 22,893 |  |  | $ | (184 | ) |  | $ | 27,674 |  |  | $ | (139 | ) |  | $ | 50,567 |  |  | $ | (323 | )
| September 30, 2017
| 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 | $ | 240 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 240 |  |  | $ | — |
Corporate notes/bonds | 15,254 |  |  | (43 | ) |  | 28,885 |  |  | (97 | ) |  | 44,139 |  |  | (140 | )
US government agency securities | — |  |  | — |  |  | 2,402 |  |  | (5 | ) |  | 2,402 |  |  | (5 | )
| $ | 15,494 |  |  | $ | (43 | ) |  | $ | 31,287 |  |  | $ | (102 | ) |  | $ | 46,781 |  |  | $ | (145 | )
Investments Classified by Contractual Maturity Date | The following table presents our available-for-sale marketable securities by contractual maturity date as of December 30, 2017 and September 30, 2017.
| December 30, 2017 |  | September 30, 2017
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands) |  | (in thousands)
Due in one year or less | $ | 20,025 |  |  | $ | 19,962 |  |  | $ | 18,274 |  |  | $ | 18,244 |
Due after one year through three years | 30,865 |  |  | 30,605 |  |  | 32,184 |  |  | 32,071 |
| $ | 50,890 |  |  | $ | 50,567 |  |  | $ | 50,458 |  |  | $ | 50,315 |

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