Fair Value Measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Oct. 02, 2021	Jul. 03, 2021
Assets:
Short-term investments:	$ 1,273.6	$ 1,171.7
Cash held in bank	196.1	128.3
Certificates of deposit
Assets:
Short-term investments:	28.5	28.5
Commercial paper
Assets:
Short-term investments:	124.8	136.7
Corporate debt securities
Assets:
Short-term investments:	671.4	625.9
Municipal bonds
Assets:
Short-term investments:	2.0	1.0
U.S. Agency securities
Assets:
Short-term investments:	28.2	29.3
U.S. Treasury securities
Assets:
Short-term investments:	418.7	350.3
Recurring basis
Assets:
Total assets	1,688.5	1,817.7
Recurring basis | Certificates of deposit
Assets:
Short-term investments:	28.5	28.5
Recurring basis | Commercial paper
Assets:
Short-term investments:	124.8	136.7
Recurring basis | Asset-backed securities
Assets:
Short-term investments:	0.0
Recurring basis | Corporate debt securities
Assets:
Short-term investments:	671.4	625.9
Recurring basis | Municipal bonds
Assets:
Short-term investments:	2.0	1.0
Recurring basis | Mortgage-backed securities
Assets:
Short-term investments:	0.0
Recurring basis | Foreign government bonds
Assets:
Short-term investments:	0.0
Recurring basis | U.S. Agency securities
Assets:
Short-term investments:	28.2	29.3
Recurring basis | U.S. Treasury securities
Assets:
Short-term investments:	418.7	350.3
Recurring basis | Money market funds
Assets:
Cash equivalents:	204.7	631.5
Recurring basis | U.S. Treasury securities
Assets:
Cash equivalents:	210.2
Recurring basis | Commercial paper
Assets:
Cash equivalents:		7.5
Recurring basis | Corporate debt securities
Assets:
Cash equivalents:		7.0
Recurring basis | Level 1
Assets:
Total assets	833.6	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 | Asset-backed securities
Assets:
Short-term investments:	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 | Mortgage-backed securities
Assets:
Short-term investments:	0.0
Recurring basis | Level 1 | Foreign government 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:	418.7	350.3
Recurring basis | Level 1 | Money market funds
Assets:
Cash equivalents:	204.7	631.5
Recurring basis | Level 1 | U.S. Treasury securities
Assets:
Cash equivalents:	210.2
Recurring basis | Level 1 | Commercial paper
Assets:
Cash equivalents:		0.0
Recurring basis | Level 1 | Corporate debt securities
Assets:
Cash equivalents:		0.0
Recurring basis | Level 2
Assets:
Total assets	854.9	835.9
Recurring basis | Level 2 | Certificates of deposit
Assets:
Short-term investments:	28.5	28.5
Recurring basis | Level 2 | Commercial paper
Assets:
Short-term investments:	124.8	136.7
Recurring basis | Level 2 | Asset-backed securities
Assets:
Short-term investments:	0.0
Recurring basis | Level 2 | Corporate debt securities
Assets:
Short-term investments:	671.4	625.9
Recurring basis | Level 2 | Municipal bonds
Assets:
Short-term investments:	2.0	1.0
Recurring basis | Level 2 | Mortgage-backed securities
Assets:
Short-term investments:	0.0
Recurring basis | Level 2 | Foreign government bonds
Assets:
Short-term investments:	0.0
Recurring basis | Level 2 | U.S. Agency securities
Assets:
Short-term investments:	28.2	29.3
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
Recurring basis | Level 2 | Commercial paper
Assets:
Cash equivalents:		7.5
Recurring basis | Level 2 | Corporate debt securities
Assets:
Cash equivalents:		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 | Asset-backed securities
Assets:
Short-term investments:	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 | Mortgage-backed securities
Assets:
Short-term investments:	0.0
Recurring basis | Level 3 | Foreign government 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 | 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 | Commercial paper
Assets:
Cash equivalents:		0.0
Recurring basis | Level 3 | Corporate debt securities
Assets:
Cash equivalents:		$ 0.0