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Fair Value (Tables) | 3 Months Ended
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Dec. 31, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis | Assets and liabilities recorded at fair value on a recurring basis consisted of the following (in millions):
| As of December 31, 2021 |  | As of October 1, 2021
|  |  | Fair Value Measurements |  |  |  | Fair Value Measurements
| Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents* | $ | 876.4 |  |  | $ | 872.3 |  |  | $ | 4.1 |  |  | $ | — |  |  | $ | 882.9 |  |  | $ | 882.9 |  |  | $ | — |  |  | $ | — |
U.S. Treasury and government securities | 11.2 |  |  | 0.8 |  |  | 10.4 |  |  | — |  |  | 13.6 |  |  | 2.6 |  |  | 11.0 |  |  | — |
Corporate bonds and notes | 121.5 |  |  | — |  |  | 121.5 |  |  | — |  |  | 117.0 |  |  | — |  |  | 117.0 |  |  | — |
Municipal bonds | 7.8 |  |  | — |  |  | 7.8 |  |  | — |  |  | 13.7 |  |  | — |  |  | 13.7 |  |  | — |
Total | $ | 1,016.9 |  |  | $ | 873.1 |  |  | $ | 143.8 |  |  | $ | — |  |  | $ | 1,027.2 |  |  | $ | 885.5 |  |  | $ | 141.7 |  |  | $ | — |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The estimated fair value of debt consists of the following (in millions):
| As of
| December 31, 2021 |  | October 1, 2021
0.90% Senior Notes due 2023 | $ | 499.6 |  |  | $ | 501.0 |
1.80% Senior Notes due 2026 | 495.3 |  |  | 507.5 |
3.00% Senior Notes due 2031 | 507.5 |  |  | 514.6 |
Total debt | $ | 1,502.4 |  |  | $ | 1,523.1 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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