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Financial Instruments and Fair Value Measurement (Tables) | 3 Months Ended
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Dec. 31, 2016
Financial Instruments and Fair Value Measurement |
Summary of available-for-sale securities |
|  |  |  | Gross |  | Gross |  | Estimated |
|  |  |  | Unrealized |  | Unrealized |  | Fair |
|  | Cost |  | Gains |  | Losses |  | Value |
|  | (in thousands)
Equity securities December 31, 2016 |  | $ | 38,473 |  | $ | 53,294 |  | $ | — |  | $ | 91,767 |
Equity securities September 30, 2016 |  | $ | 38,473 |  | $ | 33,051 |  | $ | — |  | $ | 71,524 |
Summary of assets measured at fair value |
|  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
|  | (in thousands) |
Recurring fair value measurements: |  |  |  |  |  |  |  |  |
Short-term investments: |  |  |  |  |  |  |  |  |
Corporate debt securities |  | $ | 25,392 |  | $ | — |  | $ | 25,392 |  | $ | — |
U.S. government and federal agency securities |  | 19,871 |  | 15,883 |  | 3,988 |  | — |
Total short-term investments |  | 45,263 |  | 15,883 |  | 29,380 |  | — |
Cash and cash equivalents |  | 825,893 |  | 825,893 |  | — |  | — |
Investments |  | 91,767 |  | 91,767 |  | — |  | — |
Other current assets |  | 28,361 |  | 28,111 |  | 250 |  | — |
Other assets |  | 2,000 |  | 2,000 |  | — |  | — |
Total assets measured at fair value |  | $ | 993,284 |  | $ | 963,654 |  | $ | 29,630 |  | $ | — |
Nonrecurring fair value measurements: |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Assets held for sale (1) |  | $ | 1,106 |  | $ | — |  | $ | — |  | $ | 1,106 |
| (1) |  | Represents the book value as of December 31, 2016 of decommissioned rigs and rig related equipment written down to their estimated recoverable amounts at December 31, 2016. These assets are included in assets held for sale in our Consolidated Condensed Balance Sheets.
Summary of supplemental fair value information about long-term fixed-rate debt |
|  | December 31, |  | September 30, |
|  | 2016 |  | 2016 |
|  | (in millions) |
Carrying value of long-term fixed-rate debt |  | $ | 492.1 |  | $ | 491.8 |
Fair value of long-term fixed-rate debt |  | $ | 513.1 |  | $ | 529.6 |

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