Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 27, 2025	Jun. 28, 2025
Assets:
Short-term investments:	$ 348.9	$ 356.4
Cash held in bank	347.6	349.5
Commercial paper
Assets:
Short-term investments:	2.7	2.7
Corporate debt securities
Assets:
Short-term investments:	205.6	211.1
U.S. Agency securities
Assets:
Short-term investments:	77.2	67.7
U.S. Treasury securities
Assets:
Short-term investments:	63.4	74.9
Recurring Basis
Assets:
Total assets	774.2	527.6
Recurring Basis | Commercial paper
Assets:
Short-term investments:	2.7	2.7
Recurring Basis | Corporate debt securities
Assets:
Short-term investments:	205.6	211.1
Recurring Basis | U.S. Agency securities
Assets:
Short-term investments:	77.2	67.7
Recurring Basis | U.S. Treasury securities
Assets:
Short-term investments:	63.4	74.9
Recurring Basis | Money market funds
Assets:
Cash equivalents:	125.6	161.7
Recurring Basis | U.S. Treasury securities
Assets:
Cash equivalents:	299.7	7.0
Recurring Basis | Commercial paper
Assets:
Cash equivalents:		2.5
Recurring Basis | Level 1
Assets:
Total assets	488.7	243.6
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	0.0
Recurring Basis | Level 1 | U.S. Treasury securities
Assets:
Short-term investments:	63.4	74.9
Recurring Basis | Level 1 | Money market funds
Assets:
Cash equivalents:	125.6	161.7
Recurring Basis | Level 1 | U.S. Treasury securities
Assets:
Cash equivalents:	299.7	7.0
Recurring Basis | Level 1 | Commercial paper
Assets:
Cash equivalents:		0.0
Recurring Basis | Level 2
Assets:
Total assets	285.5	284.0
Recurring Basis | Level 2 | Commercial paper
Assets:
Short-term investments:	2.7	2.7
Recurring Basis | Level 2 | Corporate debt securities
Assets:
Short-term investments:	205.6	211.1
Recurring Basis | Level 2 | U.S. Agency securities
Assets:
Short-term investments:	77.2	67.7
Recurring Basis | Level 2 | U.S. Treasury securities
Assets:
Short-term investments:	0.0	0.0
Recurring Basis | Level 2 | Money market funds
Assets:
Cash equivalents:	0.0	0.0
Recurring Basis | Level 2 | U.S. Treasury securities
Assets:
Cash equivalents:	0.0	0.0
Recurring Basis | Level 2 | Commercial paper
Assets:
Cash equivalents:		2.5
Recurring Basis | Level 3
Assets:
Total assets	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	0.0
Recurring Basis | Level 3 | U.S. Treasury securities
Assets:
Short-term investments:	0.0	0.0
Recurring Basis | Level 3 | Money market funds
Assets:
Cash equivalents:	0.0	0.0
Recurring Basis | Level 3 | U.S. Treasury securities
Assets:
Cash equivalents:	$ 0.0	0.0
Recurring Basis | Level 3 | Commercial paper
Assets:
Cash equivalents:		$ 0.0