Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 29, 2024	Jul. 01, 2023
Assets:
Short-term investments:	$ 450.3	$ 1,154.6
Cash held in bank	196.9	254.3
Certificates of deposit
Assets:
Short-term investments:	0.8	16.5
Commercial paper
Assets:
Short-term investments:	12.6	132.7
Corporate debt securities
Assets:
Short-term investments:	243.9	468.8
U.S. Agency securities
Assets:
Short-term investments:	80.9	206.2
U.S. Treasury securities
Assets:
Short-term investments:	112.1	330.4
Recurring basis
Assets:
Total assets	690.1	1,759.3
Recurring basis | Certificates of deposit
Assets:
Short-term investments:	0.8	16.5
Recurring basis | Commercial paper
Assets:
Short-term investments:	12.6	132.7
Recurring basis | Corporate debt securities
Assets:
Short-term investments:	243.9	468.8
Recurring basis | U.S. Agency securities
Assets:
Short-term investments:	80.9	206.2
Recurring basis | U.S. Treasury securities
Assets:
Short-term investments:	112.1	330.4
Recurring basis | Commercial paper
Assets:
Cash equivalents:	15.9
Recurring basis | Money market funds
Assets:
Cash equivalents:	223.9	276.1
Recurring basis | U.S. Agency securities
Assets:
Cash equivalents:		4.0
Recurring basis | U.S. Treasury securities
Assets:
Cash equivalents:		324.6
Recurring basis | Level 1
Assets:
Total assets	336.0	931.1
Recurring basis | Level 1 | Certificates of deposit
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 1 | Commercial paper
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 1 | Corporate debt securities
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 1 | U.S. Agency securities
Assets:
Short-term investments:		0.0
Recurring basis | Level 1 | U.S. Treasury securities
Assets:
Short-term investments:	112.1	330.4
Recurring basis | Level 1 | Commercial paper
Assets:
Cash equivalents:	0.0
Recurring basis | Level 1 | Money market funds
Assets:
Cash equivalents:	223.9	276.1
Recurring basis | Level 1 | U.S. Agency securities
Assets:
Cash equivalents:		0.0
Recurring basis | Level 1 | U.S. Treasury securities
Assets:
Cash equivalents:		324.6
Recurring basis | Level 2
Assets:
Total assets	354.1	828.2
Recurring basis | Level 2 | Certificates of deposit
Assets:
Short-term investments:	0.8	16.5
Recurring basis | Level 2 | Commercial paper
Assets:
Short-term investments:	12.6	132.7
Recurring basis | Level 2 | Corporate debt securities
Assets:
Short-term investments:	243.9	468.8
Recurring basis | Level 2 | U.S. Agency securities
Assets:
Short-term investments:	80.9	206.2
Recurring basis | Level 2 | U.S. Treasury securities
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 2 | Commercial paper
Assets:
Cash equivalents:	15.9
Recurring basis | Level 2 | Money market funds
Assets:
Cash equivalents:	0.0	0.0
Recurring basis | Level 2 | U.S. Agency securities
Assets:
Cash equivalents:		4.0
Recurring basis | Level 2 | U.S. Treasury securities
Assets:
Cash equivalents:		0.0
Recurring basis | Level 3
Assets:
Total assets	0.0	0.0
Recurring basis | Level 3 | Certificates of deposit
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 3 | Commercial paper
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 3 | Corporate debt securities
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 3 | U.S. Agency securities
Assets:
Short-term investments:		0.0
Recurring basis | Level 3 | U.S. Treasury securities
Assets:
Short-term investments:	0.0	0.0
Recurring basis | Level 3 | Commercial paper
Assets:
Cash equivalents:	0.0
Recurring basis | Level 3 | Money market funds
Assets:
Cash equivalents:	$ 0.0	0.0
Recurring basis | Level 3 | U.S. Agency securities
Assets:
Cash equivalents:		0.0
Recurring basis | Level 3 | U.S. Treasury securities
Assets:
Cash equivalents:		$ 0.0