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Income Taxes - Summary of Net Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ 29.2 | $ 29.2 |
Federal and state credit carryforwards | 14.3 | 16.4 |
Property, plant and equipment | 0.6 | 2.6 |
Deferred and other revenue differences | 4.0 | 0.0 |
Interest carryforwards | 11.2 | 4.9 |
Other reserves and accrued expenses | 15.0 | 9.0 |
Other assets | 3.7 | 4.7 |
Total deferred tax assets | 78.0 | 66.8 |
Less: valuation allowance | (29.1) | (29.0) | $ (18.7)
Net deferred tax assets | 48.9 | 37.8 |
Deferred tax liabilities: |  |  |
Purchased technologies and other intangibles | (75.0) | (58.2) |
Deferred and other revenue differences | (8.1) | (0.8) |
Property, plant and equipment | (3.9) | (3.0) |
Other liabilities | (1.8) | (4.1) |
Total deferred tax liabilities | (88.8) | (66.1) |
Net deferred tax liabilities | $ (39.9) | $ (28.3) |

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