Fair Value (Schedule Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Millions | Jul. 01, 2022 | Oct. 01, 2021 |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt | $ 1,689.4 | $ 2,235.6 |
Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents* | 643 | 882.9 |
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31) | 662.2 | 1,027.2 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents* | 643 | 882.9 |
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31) | 644.2 | 885.5 |
Fair Value, Inputs, Level 2 [Member] | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt, Fair Value | 1,346.8 | 1,523.1 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents* | 0 | 0 |
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31) | 18 | 141.7 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Cash and cash equivalents* | 0 | 0 |
Assets, Fair Value Disclosure, Recurring (Deprecated 2018-01-31) | 0 | 0 |
2023 Notes | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt | 498.8 | 498.2 |
2023 Notes | Fair Value, Inputs, Level 2 [Member] | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt, Fair Value | 486.4 | 501 |
2026 Notes | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt | 496.6 | 496.2 |
2026 Notes | Fair Value, Inputs, Level 2 [Member] | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt, Fair Value | 445.8 | 507.5 |
2031 Notes | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt | 494.4 | 494 |
2031 Notes | Fair Value, Inputs, Level 2 [Member] | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt, Fair Value | 414.6 | 514.6 |
Senior Notes | | |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] | | |
Long-term Debt | 1,489.8 | 1,488.4 |
US Treasury and Government [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 10.9 | 13.6 |
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 1.2 | 2.6 |
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 9.7 | 11 |
US Treasury and Government [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 0 | 0 |
Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 0 | 117 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 0 | 0 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 0 | 117 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 0 | 0 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 8.3 | 13.7 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 0 | 0 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | 8.3 | 13.7 |
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-sale Securities | $ 0 | $ 0 |