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Marketable Investment Securities (Tables) | 9 Months Ended
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Mar. 31, 2017
Investments Debt And Equity Securities [Abstract] |
Schedule of Fair Value for Available-for-Sale Securities by Major Security Type and Class of Security | The amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security at March 31, 2017 and June 30, 2016 were as follows:
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  |  |  |  |  | unrealized |  |  | unrealized |  |  |  |  |
|  | Amortized |  |  | holding |  |  | holding |  |  | Estimated |
|  | cost |  |  | gains |  |  | losses |  |  | fair value |
At March 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 106.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 106.6 |
Cash equivalents |  |  | 17.2 |  |  |  | — |  |  |  | — |  |  | $ | 17.2 |
Total cash and cash equivalents |  |  | 123.8 |  |  |  | — |  |  |  | — |  |  |  | 123.8 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 41.5 |  |  |  | — |  |  |  | (0.1 | ) |  |  | 41.4 |
Municipal bonds |  |  | 43.5 |  |  |  | — |  |  |  | — |  |  |  | 43.5 |
Federal agency issues |  |  | 11.6 |  |  |  | — |  |  |  | — |  |  |  | 11.6 |
US government securities |  |  | 5.2 |  |  |  | — |  |  |  | — |  |  |  | 5.2 |
Total |  | $ | 225.6 |  |  | $ | — |  |  | $ | (0.1 | ) |  | $ | 225.5 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  |  |  |  |  | unrealized |  |  | unrealized |  |  |  |  |
|  | Amortized |  |  | holding |  |  | holding |  |  | Estimated |
|  | cost |  |  | gains |  |  | losses |  |  | fair value |
At June 30, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 66.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 66.1 |
Cash equivalents |  |  | 2.4 |  |  |  | — |  |  |  | — |  |  |  | 2.4 |
Total cash and cash equivalents |  |  | 68.5 |  |  |  | — |  |  |  | — |  |  |  | 68.5 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds and notes |  |  | 50.8 |  |  |  | 0.2 |  |  |  | — |  |  |  | 51.0 |
Municipal bonds |  |  | 85.4 |  |  |  | 0.2 |  |  |  | — |  |  |  | 85.6 |
Federal agency issues |  |  | 25.5 |  |  |  | — |  |  |  | — |  |  |  | 25.5 |
US government securities |  |  | 8.2 |  |  |  | 0.1 |  |  |  | — |  |  |  | 8.3 |
Total |  | $ | 238.4 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | 238.9 |
Schedule of Maturities of Debt Securities Classified as Cash Equivalents and Available-For-Sale Securities | Cash, cash equivalents, and maturities of debt securities classified as available-for-sale securities are as follows at March 31, 2017:
|  | Amortized |  |  | Estimated |
|  | cost |  |  | fair value |
Cash |  | $ | 106.6 |  |  | $ | 106.6 |
Cash equivalents |  |  | 17.2 |  |  |  | 17.2 |
Available-for-sale: |  |  |  |  |  |  |  |
Due within one year |  |  | 48.3 |  |  |  | 48.3 |
Due after one year through five years |  |  | 52.0 |  |  |  | 51.9 |
Due after five years |  |  | 1.5 |  |  |  | 1.5 |
Total |  | $ | 225.6 |  |  | $ | 225.5 |

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