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Investments (Tables) | 9 Months Ended
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Jun. 30, 2018
Investments Debt And Equity Securities [Abstract] |
Amortized Cost, Unrealized Holding Gains and (Losses) and Fair Value of Available-for-sale Securities | 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 Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- References No definition available. + Details
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