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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 44.6 | $ 75.5
Property, plant and equipment | 1.1 | 2.1
Accrued vacation | 1.4 | 3.0
AR allowance | 10.7 | 15.4
Stock compensation expense | 17.0 | 29.9
Research and development credits | 13.0 | 9.9
Uncertain state tax positions | 1.3 | 1.4
Other, net | 0.9 | 2.3
Total gross deferred tax assets | 90.0 | 139.5
Less valuation allowance | (37.8) | (40.5)
Total deferred tax assets | 52.2 | 99.0
Deferred tax liabilities: |  |
Intangible assets | 109.5 | 177.7
Total deferred tax liabilities | 109.5 | 177.7
Net deferred tax liability | $ (57.3) | $ (78.7)

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