Fair Value (Tables)

9 Months Ended

Jun. 26, 2020

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 June 26, 2020								As of September 27, 2019
			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*	$	791.3	$	648.0	$	143.3	$	—	$	851.3	$	809.5	$	41.8	$	—
U.S. Treasury and government securities	69.3		32.7		36.6		—		54.2		28.4		25.8		—
Corporate bonds and notes	261.1		—		261.1		—		72.1		—		72.1		—
Municipal bonds	40.7		—		40.7		—		104.6		—		104.6		—
Total	$	1,162.4	$	680.7	$	481.7	$	—	$	1,082.2	$	837.9	$	244.3	$	—