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Marketable Securities (Tables) | 6 Months Ended
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Apr. 01, 2017
Marketable Securities [Abstract] |
Marketable Securities | The amortized cost and fair value of marketable securities as of April 1, 2017 and September 30, 2016 were as follows:
| April 1, 2017
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 682 |  |  | $ | — |  |  | $ | — |  |  | $ | 682 |
Commercial paper | 7,492 |  |  | — |  |  | (2 | ) |  | 7,490 |
Corporate notes/bonds | 37,801 |  |  | — |  |  | (184 | ) |  | 37,617 |
US government agency securities | 2,409 |  |  | — |  |  | (7 | ) |  | 2,402 |
| $ | 48,384 |  |  | $ | — |  |  | $ | (193 | ) |  | $ | 48,191 |
| September 30, 2016
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (in thousands)
Certificates of deposit | $ | 681 |  |  | $ | — |  |  | $ | — |  |  | $ | 681 |
Commercial paper | 11,945 |  |  | — |  |  | (20 | ) |  | 11,925 |
Corporate notes/bonds | 34,701 |  |  | — |  |  | (100 | ) |  | 34,601 |
US government agency securities | 2,411 |  |  | — |  |  | (2 | ) |  | 2,409 |
| $ | 49,738 |  |  | $ | — |  |  | $ | (122 | ) |  | $ | 49,616 |
Investments Classified by Contractual Maturity Date | The following table presents our available-for-sale marketable securities by contractual maturity date, as of April 1, 2017 and September 30, 2016.
| April 1, 2017 |  | September 30, 2016
| Amortized cost |  | Fair value |  | Amortized cost |  | Fair value
| (in thousands) |  | (in thousands)
Due in one year or less | $ | 23,492 |  |  | $ | 23,449 |  |  | $ | 18,585 |  |  | $ | 18,549 |
Due after one year through three years | 24,892 |  |  | 24,742 |  |  | 31,153 |  |  | 31,067 |
| $ | 48,384 |  |  | $ | 48,191 |  |  | $ | 49,738 |  |  | $ | 49,616 |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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