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Investments | 3 Months Ended
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Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract] |
Investments | Investments We invest in pre-funded municipal bonds which are generally secured by escrowed-to-maturity U.S. Treasury notes. Municipal bonds represent debt obligations issued by states, cities, counties and other governmental entities, which earn interest that is exempt from federal income taxes. Additionally, we invest in certificates of deposit issued by financial institutions and corporate bonds from large cap industrial and selected financial companies with a minimum credit rating of A. We have the ability and intention to hold our investments until maturity and therefore classify these investments as held-to-maturity and report them at amortized cost. Amortized cost and fair value for investments classified as held-to-maturity at December 31, 2014 were as follows:
|  |  |  |  |  |  |  | Estimated
|  | Amortized |  | Gross Unrealized |  | Fair Market
|  | Cost |  | Gains |  | Losses |  | Value
Due in less than 1 year: |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 25,291 |  |  | $ | 15 |  |  | $ | — |  |  | $ | 25,306 |
Corporate bonds |  | 19,488 |  |  | — |  |  | (24 | ) |  | 19,464 |
Certificates of deposit |  | 4,129 |  |  | — |  |  | — |  |  | 4,129 |
Due in 1 - 2 years: |  |  |  |  |  |  |  |
Municipal bonds |  | 5,389 |  |  | 10 |  |  | — |  |  | 5,399 |
Corporate bonds |  | 2,818 |  |  | — |  |  | (6 | ) |  | $ | 2,812 |
Certificates of deposit |  | 1,087 |  |  | — |  |  | — |  |  | 1,087 |
|  | $ | 58,202 |  |  | $ | 25 |  |  | $ | (30 | ) |  | $ | 58,197 |
Amortized cost and fair value for investments classified as held-to-maturity at September 30, 2014 were as follows:
|  |  |  |  |  |  |  | Estimated
|  | Amortized |  | Gross Unrealized |  | Fair Market
|  | Cost |  | Gains |  | Losses |  | Value
Due in less than 1 year: |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 26,894 |  |  | $ | 20 |  |  | $ | — |  |  | $ | 26,914 |
Corporate bonds |  | 16,836 |  |  | 1 |  |  | (24 | ) |  | 16,813 |
Certificates of deposit |  | 2,176 |  |  | — |  |  | — |  |  | 2,176 |
Due in 1 - 2 years: |  |  |  |  |  |  |  |
Municipal bonds |  | 4,230 |  |  | 7 |  |  | — |  |  | 4,237 |
Corporate bonds |  | 4,054 |  |  | — |  |  | (13 | ) |  | $ | 4,041 |
Certificates of deposit |  | 2,973 |  |  | — |  |  | — |  |  | 2,973 |
|  | $ | 57,163 |  |  | $ | 28 |  |  | $ | (37 | ) |  | $ | 57,154 |
Investments are exposed to various risks, including interest rate, market and credit risk, and as a result, it is possible that changes in the values of these investments may occur and that such changes could affect the amounts reported in the condensed consolidated balance sheets and condensed consolidated statements of comprehensive income.

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