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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Assets And Liabilities Measured At Fair Value On A Recurring Basis |
|  |  | Fair Value Measurements at Reporting Date Using
| Balance at March 31, 2019 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 2,055.1 |  |  | $ | 2,055.1 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Commercial paper | 0.2 |  |  | — |  |  | 0.2 |  |  | — |
Corporate debt securities | 4.8 |  |  | — |  |  | 4.8 |  |  | — |
Foreign government obligations | 3.7 |  |  | — |  |  | 3.7 |  |  | — |
Mortgage and other asset-backed securities | 3.3 |  |  | — |  |  | 3.3 |  |  | — |
Total available-for-sale debt securities | 12.0 |  |  | — |  |  | 12.0 |  |  | — |
Marketable equity securities | 64.6 |  |  | 64.6 |  |  | — |  |  | — |
Total short-term investments | 76.6 |  |  | 64.6 |  |  | 12.0 |  |  | — |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Derivative assets | 19.9 |  |  | 0.2 |  |  | 19.7 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Agency obligations | 6.0 |  |  | — |  |  | 6.0 |  |  | — |
Corporate debt securities | 119.0 |  |  | — |  |  | 119.0 |  |  | — |
Auction rate securities | 5.7 |  |  | — |  |  | — |  |  | 5.7 |
U.S. government treasury securities | 109.7 |  |  | 109.7 |  |  | — |  |  | — |
State and local government obligations | 4.9 |  |  | — |  |  | 4.9 |  |  | — |
Mortgage and other asset-backed securities | 6.6 |  |  | — |  |  | 6.6 |  |  | — |
Total long-term investments | 251.9 |  |  | 109.7 |  |  | 136.5 |  |  | 5.7 |
Other long-term assets: |  |  |  |  |  |  |
Derivative assets | 10.8 |  |  | — |  |  | 10.8 |  |  | — |
Total assets | $ | 2,414.3 |  |  | $ | 2,229.6 |  |  | $ | 179.0 |  |  | $ | 5.7 |
Liabilities: |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |
Derivative liabilities | $ | 11.8 |  |  | $ | 1.4 |  |  | $ | 10.4 |  |  | $ | — |
Other long-term liabilities: |  |  |  |  |  |  |
Derivative liabilities | 44.5 |  |  | — |  |  | 44.5 |  |  | — |
Total liabilities | $ | 56.3 |  |  | $ | 1.4 |  |  | $ | 54.9 |  |  | $ | — |
|  |  | Fair Value Measurements at Reporting Date Using
| Balance at September 30, 2018 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 8,756.3 |  |  | $ | 8,756.3 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Commercial paper | 8.4 |  |  | — |  |  | 8.4 |  |  | — |
Corporate debt securities | 91.8 |  |  | — |  |  | 91.8 |  |  | — |
Mortgage and other asset-backed securities | 6.0 |  |  | — |  |  | 6.0 |  |  | — |
Total available-for-sale debt securities | 106.2 |  |  | — |  |  | 106.2 |  |  | — |
Marketable equity securities | 75.3 |  |  | 75.3 |  |  | — |  |  | — |
Total short-term investments | 181.5 |  |  | 75.3 |  |  | 106.2 |  |  | — |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Derivative assets | 24.5 |  |  | 1.2 |  |  | 23.3 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Agency obligations | 5.9 |  |  | — |  |  | 5.9 |  |  | — |
Corporate debt securities | 114.5 |  |  | — |  |  | 114.5 |  |  | — |
Auction rate securities | 5.9 |  |  | — |  |  | — |  |  | 5.9 |
Foreign government obligations | 3.6 |  |  | — |  |  | 3.6 |  |  | — |
U.S. government treasury securities | 108.1 |  |  | 108.1 |  |  | — |  |  | — |
State and local government obligations | 4.8 |  |  | — |  |  | 4.8 |  |  | — |
Mortgage and other asset-backed securities | 24.9 |  |  | — |  |  | 24.9 |  |  | — |
Total long-term investments | 267.7 |  |  | 108.1 |  |  | 153.7 |  |  | 5.9 |
Other long-term assets: |  |  |  |  |  |  |
Derivative assets | 10.4 |  |  | — |  |  | 10.4 |  |  | — |
Total assets | $ | 9,240.4 |  |  | $ | 8,940.9 |  |  | $ | 293.6 |  |  | $ | 5.9 |
Liabilities: |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |
Derivative liabilities | $ | 6.5 |  |  | $ | 0.4 |  |  | $ | 6.1 |  |  | $ | — |
Other long-term liabilities: |  |  |  |  |  |  |
Derivative liabilities | 43.5 |  |  | — |  |  | 43.5 |  |  | — |
Total liabilities | $ | 50.0 |  |  | $ | 0.4 |  |  | $ | 49.6 |  |  | $ | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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