Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 27, 2025	Jun. 28, 2025
Assets:
Short-term investments:	$ 497.6	$ 356.4
Total assets	695.2	527.6
Cash held in bank	460.1	349.5
Commercial paper
Assets:
Short-term investments:	24.6	2.7
Corporate debt securities
Assets:
Short-term investments:	276.0	211.1
U.S. Agency securities
Assets:
Short-term investments:	137.2	67.7
U.S. Treasury securities
Assets:
Short-term investments:	59.8	74.9
Certificates of deposit
Assets:
Cash equivalents:	31.3
Commercial paper
Assets:
Cash equivalents:		2.5
Money market funds
Assets:
Cash equivalents:	74.6	161.7
U.S. Treasury securities
Assets:
Cash equivalents:	91.7	7.0
Level 1
Assets:
Total assets	257.4	243.6
Level 1 | Commercial paper
Assets:
Short-term investments:	0.0	0.0
Level 1 | Corporate debt securities
Assets:
Short-term investments:	0.0	0.0
Level 1 | U.S. Agency securities
Assets:
Short-term investments:	0.0	0.0
Level 1 | U.S. Treasury securities
Assets:
Short-term investments:	59.8	74.9
Level 1 | Certificates of deposit
Assets:
Cash equivalents:	31.3
Level 1 | Commercial paper
Assets:
Cash equivalents:		0.0
Level 1 | Money market funds
Assets:
Cash equivalents:	74.6	161.7
Level 1 | U.S. Treasury securities
Assets:
Cash equivalents:	91.7	7.0
Level 2
Assets:
Total assets	437.8	284.0
Level 2 | Commercial paper
Assets:
Short-term investments:	24.6	2.7
Level 2 | Corporate debt securities
Assets:
Short-term investments:	276.0	211.1
Level 2 | U.S. Agency securities
Assets:
Short-term investments:	137.2	67.7
Level 2 | U.S. Treasury securities
Assets:
Short-term investments:	0.0	0.0
Level 2 | Certificates of deposit
Assets:
Cash equivalents:	0.0
Level 2 | Commercial paper
Assets:
Cash equivalents:		2.5
Level 2 | Money market funds
Assets:
Cash equivalents:	0.0	0.0
Level 2 | U.S. Treasury securities
Assets:
Cash equivalents:	0.0	0.0
Level 3
Assets:
Total assets	0.0	0.0
Level 3 | Commercial paper
Assets:
Short-term investments:	0.0	0.0
Level 3 | Corporate debt securities
Assets:
Short-term investments:	0.0	0.0
Level 3 | U.S. Agency securities
Assets:
Short-term investments:	0.0	0.0
Level 3 | U.S. Treasury securities
Assets:
Short-term investments:	0.0	0.0
Level 3 | Certificates of deposit
Assets:
Cash equivalents:	0.0
Level 3 | Commercial paper
Assets:
Cash equivalents:		0.0
Level 3 | Money market funds
Assets:
Cash equivalents:	0.0	0.0
Level 3 | U.S. Treasury securities
Assets:
Cash equivalents:	$ 0.0	$ 0.0