Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Apr. 02, 2022	Jul. 03, 2021
Assets:
Short-term investments:	$ 1,433.8	$ 1,171.7
Cash held in bank	149.4	128.3
Certificates of deposit
Assets:
Short-term investments:	11.3	28.5
Commercial paper
Assets:
Short-term investments:	99.3	136.7
Corporate debt securities
Assets:
Short-term investments:	643.1	625.9
Municipal bonds
Assets:
Short-term investments:	1.0	1.0
U.S. Agency securities
Assets:
Short-term investments:	64.0	29.3
U.S. Treasury securities
Assets:
Short-term investments:	615.1	350.3
Recurring basis
Assets:
Total assets	2,414.7	1,817.7
Recurring basis | Certificates of deposit
Assets:
Short-term investments:	11.3	28.5
Recurring basis | Commercial paper
Assets:
Short-term investments:	99.3	136.7
Recurring basis | Corporate debt securities
Assets:
Short-term investments:	643.1	625.9
Recurring basis | Municipal bonds
Assets:
Short-term investments:	1.0	1.0
Recurring basis | U.S. Agency securities
Assets:
Short-term investments:	64.0	29.3
Recurring basis | U.S. Treasury securities
Assets:
Short-term investments:	615.1	350.3
Recurring basis | Commercial paper
Assets:
Cash equivalents:	291.9	7.5
Recurring basis | Money market funds
Assets:
Cash equivalents:	178.4	631.5
Recurring basis | U.S. Treasury securities
Assets:
Cash equivalents:	500.4
Recurring basis | Corporate debt securities
Assets:
Cash equivalents:	10.2	7.0
Recurring basis | Level 1
Assets:
Total assets	1,293.9	981.8
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	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:	615.1	350.3
Recurring basis | Level 1 | Commercial paper
Assets:
Cash equivalents:	0.0	0.0
Recurring basis | Level 1 | Money market funds
Assets:
Cash equivalents:	178.4	631.5
Recurring basis | Level 1 | U.S. Treasury securities
Assets:
Cash equivalents:	500.4
Recurring basis | Level 1 | Corporate debt securities
Assets:
Cash equivalents:	0.0	0.0
Recurring basis | Level 2
Assets:
Total assets	1,120.8	835.9
Recurring basis | Level 2 | Certificates of deposit
Assets:
Short-term investments:	11.3	28.5
Recurring basis | Level 2 | Commercial paper
Assets:
Short-term investments:	99.3	136.7
Recurring basis | Level 2 | Corporate debt securities
Assets:
Short-term investments:	643.1	625.9
Recurring basis | Level 2 | Municipal bonds
Assets:
Short-term investments:	1.0	1.0
Recurring basis | Level 2 | U.S. Agency securities
Assets:
Short-term investments:	64.0	29.3
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:	291.9	7.5
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
Recurring basis | Level 2 | Corporate debt securities
Assets:
Cash equivalents:	10.2	7.0
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	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 equivalents:	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
Recurring basis | Level 3 | Corporate debt securities
Assets:
Cash equivalents:	$ 0.0	$ 0.0