Income Taxes - Schedule of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2026	Jun. 30, 2025
Deferred tax assets:
Net operating loss	$ 1,084.8	$ 1,039.5
Accruals and reserves	36.0	65.1
R&D credit	89.1	81.9
Accrued legal and professional fees	9.5	2.9
Non-qualified stock options	96.3	95.0
Restricted stock options	9.4	11.8
Disallowed interest carryover	97.5	68.8
Intangible amortization	47.4	51.1
Capitalized R&E	77.7	119.4
Inventory capitalization	28.6	52.0
Lease liability	105.4	115.8
Deferred revenue	4.6	7.9
Construction in progress	6.5	26.3
Property and equipment	1.1	0.0
Other	5.2	4.4
Total deferred tax assets:	1,699.1	1,741.9
Valuation allowance	(1,620.5)	(1,647.4)
Deferred tax liabilities:
Prepaid expenses	(2.2)	(2.4)
Property and equipment	0.0	(6.2)
Right-of-use assets	(72.0)	(81.4)
Convertible securities	(3.7)	(4.2)
Other	(0.5)	(0.1)
Total deferred tax liabilities:	(78.4)	(94.3)
Deferred tax assets, net	$ 0.2	$ 0.2

Deferred Tax Asset, Operating Lease, Liability

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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