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Investments | 9 Months Ended
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Jun. 30, 2018
Investments Debt And Equity Securities [Abstract] |
Investments | 5. Investments Investments consisted principally of commercial paper and corporate bond securities and are classified as available-for-sale as of June 30, 2018 and September 30, 2017. These available-for-sale securities are reported at fair value with unrealized gains and losses, net of tax, excluded from the condensed consolidated statements of operations and reported in the condensed consolidated statements of comprehensive (loss) income as well as a separate component of stockholders’ equity in the condensed consolidated balance sheets, except for other-than-temporary impairments, which are reported as a charge to current earnings as they occur. A loss would be recognized when there is an other-than-temporary impairment in the fair value of any individual security classified as available-for-sale, with the associated net unrealized loss reclassified out of accumulated other comprehensive (loss) income with a corresponding adjustment to other income (loss). This adjustment would result in a new cost basis for the investment. Interest earned on debt securities, including amortization of premiums and accretion of discounts, is included in investment income, net within other (loss) income. Realized gains and losses from the sales of debt securities, which are included in other (loss) income, are determined using the specific identification method. Investment purchases are accounted for on the date the trade is executed, which may not be the same as the date the transaction is cash settled. The amortized cost, unrealized holding gains and losses, and fair value of available-for-sale securities were as follows:
|  | June 30, 2018 |
(Dollars in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-term commercial paper and corporate bonds |  | $ | 34,814 |  |  | $ | — |  |  | $ | (54 | ) |  | $ | 34,760 |
Long-term corporate bonds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 34,814 |  |  | $ | — |  |  | $ | (54 | ) |  | $ | 34,760 |
|  | September 30, 2017 |
(Dollars in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
Short-term commercial paper and corporate bonds |  | $ | 31,817 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 31,802 |
Total |  | $ | 31,817 |  |  | $ | — |  |  | $ | (15 | ) |  | $ | 31,802 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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