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Fair Value Measurements | 9 Months Ended
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Jun. 30, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements Assets and liabilities measured at fair value on a recurring basis (in millions):
|  |  | Fair Value Measurements at Reporting Date Using
| Balance at June 30, 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 | $ | 4,763.3 |  |  | $ | 4,763.3 |  |  | $ | — |  |  | $ | — |
Short-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Commercial paper | 0.2 |  |  | — |  |  | 0.2 |  |  | — |
Corporate debt securities | 4.9 |  |  | — |  |  | 4.9 |  |  | — |
Mortgage and other asset-backed securities | 0.2 |  |  | — |  |  | 0.2 |  |  | — |
Total available-for-sale debt securities | 5.3 |  |  | — |  |  | 5.3 |  |  | — |
Marketable equity securities | 66.8 |  |  | 66.8 |  |  | — |  |  | — |
Total short-term investments | 72.1 |  |  | 66.8 |  |  | 5.3 |  |  | — |
Prepaid expenses and other current assets: |  |  |  |  |  |  |
Derivative assets | 13.5 |  |  | 0.1 |  |  | 13.4 |  |  | — |
Long-term investments: |  |  |  |  |  |  |
Available-for-sale debt securities |  |  |  |  |  |  |
Corporate debt securities | 101.6 |  |  | — |  |  | 101.6 |  |  | — |
Auction rate securities | 5.7 |  |  | — |  |  | — |  |  | 5.7 |
U.S. government treasury securities | 106.2 |  |  | 106.2 |  |  | — |  |  | — |
State and local government obligations | 5.0 |  |  | — |  |  | 5.0 |  |  | — |
Mortgage and other asset-backed securities | 4.1 |  |  | — |  |  | 4.1 |  |  | — |
Total long-term investments | 222.6 |  |  | 106.2 |  |  | 110.7 |  |  | 5.7 |
Other long-term assets: |  |  |  |  |  |  |
Derivative assets | 10.3 |  |  | — |  |  | 10.3 |  |  | — |
Total assets | $ | 5,081.8 |  |  | $ | 4,936.4 |  |  | $ | 139.7 |  |  | $ | 5.7 |
Liabilities: |  |  |  |  |  |  |
Accrued liabilities: |  |  |  |  |  |  |
Derivative liabilities | $ | 11.3 |  |  | $ | 0.6 |  |  | $ | 10.7 |  |  | $ | — |
Other long-term liabilities: |  |  |  |  |  |  |
Derivative liabilities | 14.2 |  |  | — |  |  | 14.2 |  |  | — |
Total liabilities | $ | 25.5 |  |  | $ | 0.6 |  |  | $ | 24.9 |  |  | $ | — |
|  |  | 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 |  |  | $ | — |
There were no material transfers between levels, and there was no significant activity within Level 3 instruments during the periods presented. The fair values of any financial instruments presented above exclude the impact of netting assets and liabilities when a legally enforceable master netting agreement exists. Gross unrealized holding gains and losses on available-for-sale debt securities and marketable equity securities were not material as of June 30, 2019 and September 30, 2018. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Assets and liabilities recognized or disclosed at fair value on the condensed consolidated financial statements on a nonrecurring basis include items such as property, plant and equipment, goodwill and other intangible assets and other assets. These assets are measured at fair value if determined to be impaired. The estimated fair value of our long-term debt based on the quoted market price (Level 2) is included at Note 9, Debt. There were no material fair value adjustments during the quarter and three quarters ended June 30, 2019 and July 1, 2018.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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