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Fair Value (Tables)
 3 Months Ended
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, 2021As of October 1, 2021
Fair Value MeasurementsFair 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 securities11.2 0.8 10.4 — 13.6 2.6 11.0 — 
Corporate bonds and notes 121.5 — 121.5 — 117.0 — 117.0 — 
Municipal bonds7.8 — 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 2026495.3 507.5 
3.00% Senior Notes due 2031507.5 514.6 
Total debt$1,502.4 $1,523.1