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Marketable Securities | 12 Months Ended
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Sep. 30, 2017
Marketable Securities [Abstract] |
MARKETABLE SECURITIES | MARKETABLE SECURITIES Our marketable securities consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds. We analyze our available-for-sale marketable securities for impairment on an ongoing basis. When we perform this analysis, we consider factors such as the length of time and extent to which the securities have been in an unrealized loss position and the trend of any unrealized losses. We also consider whether an unrealized loss is a temporary loss or an other-than-temporary loss such as: (a) whether we have the intent to sell the security, or (b) whether it is more likely than not that we will be required to sell the security before its anticipated recovery, or (c) permanent impairment due to bankruptcy or insolvency. In order to estimate the fair value for each security in our investment portfolio, we obtain quoted market prices and trading activity for each security where available. We obtain relevant information from our investment advisor and, if warranted, also may review the financial solvency of certain security issuers. As of September 30, 2017, 25 of our 44 securities that we held were trading below our amortized cost basis. We determined each decline in value to be temporary based upon the above described factors. We expect to realize the fair value of these securities, plus accrued interest, either at the time of maturity or when the security is sold. All of our current holdings are classified as available-for-sale marketable securities and are recorded at fair value on our consolidated balance sheet with the unrealized gains and losses recorded in accumulated other comprehensive loss. All of our current marketable securities are scheduled to mature in less than one year and our non-current marketable securities are scheduled to mature in less than two years. We received proceeds from the sale of our available-for-sale marketable securities of $87.1 million, $73.7 million and $38.0 million for fiscal 2017, 2016 and 2015, respectively. At September 30, 2017 our marketable securities consisted of (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Corporate bonds | $ | 28,275 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 28,255 |
Certificates of deposit | 3,756 |  |  | 4 |  |  | — |  |  | 3,760 |
Current marketable securities | 32,031 |  |  | 4 |  |  | (20 | ) |  | 32,015 |
Non-current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | 4,757 |  |  | — |  |  | (4 | ) |  | 4,753 |
Total marketable securities | $ | 36,788 |  |  | $ | 4 |  |  | $ | (24 | ) |  | $ | 36,768 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $211.
At September 30, 2016 our marketable securities consisted of (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Corporate bonds | $ | 28,801 |  |  | $ | — |  |  | $ | (34 | ) |  | $ | 28,767 |
Commercial paper | 23,963 |  |  | — |  |  | (20 | ) |  | 23,943 |
Certificates of deposit | 3,755 |  |  | 13 |  |  | — |  |  | 3,768 |
Government municipal bonds | 1,904 |  |  | — |  |  | — |  |  | 1,904 |
Current marketable securities | 58,423 |  |  | 13 |  |  | (54 | ) |  | 58,382 |
Non-current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | 3,505 |  |  | 36 |  |  | — |  |  | 3,541 |
Total marketable securities | $ | 61,928 |  |  | $ | 49 |  |  | $ | (54 | ) |  | $ | 61,923 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $271.
7. MARKETABLE SECURITIES (CONTINUED) The following tables show the fair values and gross unrealized losses of our available-for-sale securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
| September 30, 2017
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Corporate bonds | $ | 26,196 |  |  | $ | (20 | ) |  | $ | — |  |  | $ | — |
Certificates of deposit | 3,751 |  |  | (4 | ) |  | — |  |  | — |
Total | $ | 29,947 |  |  | $ | (24 | ) |  | $ | — |  |  | $ | — |
| September 30, 2016
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Corporate bonds | $ | 24,454 |  |  | $ | (33 | ) |  | $ | 4,102 |  |  | $ | (1 | )
Commercial paper | 23,943 |  |  | (20 | ) |  | — |  |  | — |
Total | $ | 48,397 |  |  | $ | (53 | ) |  | $ | 4,102 |  |  | $ | (1 | )

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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