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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENT (Tables) | 12 Months Ended
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Sep. 30, 2015
FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENT |
Summary of available-for-sale securities |
|  | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |
|  | (in thousands) |
Equity Securities: |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2015 |  | $ | 64,462 |  | $ | 28,530 |  | $ | 1,509 |  | $ | 91,483 |
September 30, 2014 |  | $ | 64,462 |  | $ | 157,838 |  | $ | — |  | $ | 222,300 |
Summary of assets measured at fair value on a recurring basis | The following table summarizes our assets measured at fair value on a recurring basis presented in our Consolidated Balance Sheets as of September 30, 2015:
|  | Total Measured at Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |
|  | (in thousands) |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Certificate of deposit |  | $ | 2,101 |  | $ | — |  | $ | 2,101 |  | $ | — |
Corporate debt securities |  |  | 27,139 |  |  | — |  |  | 27,139 |  |  | — |
U.S. government and federal agency securities |  |  | 16,303 |  |  | 4,823 |  |  | 11,480 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total short-term investments |  |  | 45,543 |  |  | 4,823 |  |  | 40,720 |  |  | — |
Cash and cash equivalents |  |  | 717,977 |  |  | 717,977 |  |  | — |  |  | — |
Investments |  |  | 91,483 |  |  | 91,483 |  |  | — |  |  | — |
Other current assets |  |  | 38,095 |  |  | 37,845 |  |  | 250 |  |  | — |
Other assets |  |  | 2,000 |  |  | 2,000 |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total assets measured at fair value |  | $ | 895,098 |  | $ | 854,128 |  | $ | 40,970 |  | $ | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of supplemental fair value information about long-term fixed-rate debt |
|  | September 30, |
|  | 2015 |  | 2014 (as adjusted) |
|  | (in millions) |
Carrying value of long-term fixed-rate debt |  | $ | 531.5 |  | $ | 79.1 |
Fair value of long-term fixed-rate debt |  | $ | 553.5 |  | $ | 84.3 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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