Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2023	Jul. 01, 2023
Assets:
Cash and cash equivalents	$ 861.6	$ 859.0
Short-term investments:	1,082.7	1,154.6
Cash held in bank	156.3	254.3
Certificates of deposit
Assets:
Short-term investments:	29.6	16.5
Commercial paper
Assets:
Short-term investments:	119.1	132.7
Corporate debt securities
Assets:
Short-term investments:	456.2	468.8
Municipal bonds
Assets:
Short-term investments:	4.6
U.S. Agency securities
Assets:
Short-term investments:	193.3	206.2
U.S. Treasury securities
Assets:
Short-term investments:	279.9	330.4
Commercial paper
Assets:
Cash and cash equivalents	4.8
Money market funds
Assets:
Cash and cash equivalents	285.3	276.1
U.S. Agency securities
Assets:
Cash and cash equivalents		4.0
U.S. Treasury securities
Assets:
Cash and cash equivalents	415.2	324.6
Recurring Basis
Assets:
Total assets	1,788.0	1,759.3
Recurring Basis | Certificates of deposit
Assets:
Short-term investments:	29.6	16.5
Recurring Basis | Commercial paper
Assets:
Short-term investments:	119.1	132.7
Recurring Basis | Corporate debt securities
Assets:
Short-term investments:	456.2	468.8
Recurring Basis | Municipal bonds
Assets:
Short-term investments:	4.6
Recurring Basis | U.S. Agency securities
Assets:
Short-term investments:	193.3	206.2
Recurring Basis | U.S. Treasury securities
Assets:
Short-term investments:	279.9	330.4
Recurring Basis | Commercial paper
Assets:
Cash and cash equivalents	4.8
Recurring Basis | Money market funds
Assets:
Cash and cash equivalents	285.3	276.1
Recurring Basis | U.S. Agency securities
Assets:
Cash and cash equivalents		4.0
Recurring Basis | U.S. Treasury securities
Assets:
Cash and cash equivalents	415.2	324.6
Recurring Basis | Level 1
Assets:
Total assets	980.4	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 | Municipal bonds
Assets:
Short-term investments:	0.0
Recurring Basis | Level 1 | U.S. Agency securities
Assets:
Short-term investments:	0.0	0.0
Recurring Basis | Level 1 | U.S. Treasury securities
Assets:
Short-term investments:	279.9	330.4
Recurring Basis | Level 1 | Commercial paper
Assets:
Cash and cash equivalents	0.0
Recurring Basis | Level 1 | Money market funds
Assets:
Cash and cash equivalents	285.3	276.1
Recurring Basis | Level 1 | U.S. Agency securities
Assets:
Cash and cash equivalents		0.0
Recurring Basis | Level 1 | U.S. Treasury securities
Assets:
Cash and cash equivalents	415.2	324.6
Recurring Basis | Level 2
Assets:
Total assets	807.6	828.2
Recurring Basis | Level 2 | Certificates of deposit
Assets:
Short-term investments:	29.6	16.5
Recurring Basis | Level 2 | Commercial paper
Assets:
Short-term investments:	119.1	132.7
Recurring Basis | Level 2 | Corporate debt securities
Assets:
Short-term investments:	456.2	468.8
Recurring Basis | Level 2 | Municipal bonds
Assets:
Short-term investments:	4.6
Recurring Basis | Level 2 | U.S. Agency securities
Assets:
Short-term investments:	193.3	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 and cash equivalents	4.8
Recurring Basis | Level 2 | Money market funds
Assets:
Cash and cash equivalents	0.0	0.0
Recurring Basis | Level 2 | U.S. Agency securities
Assets:
Cash and cash equivalents		4.0
Recurring Basis | Level 2 | U.S. Treasury securities
Assets:
Cash and cash equivalents	0.0	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 | Municipal bonds
Assets:
Short-term investments:	0.0
Recurring Basis | Level 3 | U.S. Agency securities
Assets:
Short-term investments:	0.0	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 and cash equivalents	0.0
Recurring Basis | Level 3 | Money market funds
Assets:
Cash and cash equivalents	0.0	0.0
Recurring Basis | Level 3 | U.S. Agency securities
Assets:
Cash and cash equivalents		0.0
Recurring Basis | Level 3 | U.S. Treasury securities
Assets:
Cash and cash equivalents	$ 0.0	$ 0.0