Income Taxes - Tax Effects of Temporary Differences that Give Rise to Significant Portions of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 27, 2021	Jun. 28, 2020
Deferred tax assets:
Compensation	$ 10.4	$ 4.4
Inventories	13.6	7.9
Sales return reserve and allowance for bad debts	2.3	2.6
Federal and state net operating loss carryforwards	360.6	180.1
Federal credits	42.1	30.3
State credits	1.2	1.9
48C investment tax credits	36.6	37.5
Investments	0.3	0.0
Stock-based compensation	6.1	8.3
Deferred revenue	26.3	23.1
Lease liabilities	6.2	6.5
Other	4.5	5.0
Total gross deferred assets	510.2	307.6
Less valuation allowance	(414.4)	(208.5)
Deferred tax assets, net	95.8	99.1
Deferred tax liabilities:
Property and equipment	(36.9)	(27.8)
Intangible assets	(16.6)	(19.2)
Investments	1.1	1.6
Prepaid taxes and other	(0.7)	(0.7)
Foreign earnings recapture	0.0	(2.0)
Taxes on unremitted foreign earnings	(1.5)	0.0
Lease assets	(6.1)	(6.3)
Convertible notes	(34.4)	(42.1)
Total gross deferred liability	(97.3)	(99.7)
Deferred tax liability, net	$ (1.5)	$ (0.6)