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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 75.5 | $ 54.4
Property, plant and equipment | 2.1 | 1.8
Accrued vacation | 3.0 | 2.0
Allowance for doubtful accounts | 9.7 | 2.4
Stock compensation expense | 29.9 | 27.0
Research and development credits | 9.9 | 9.4
Uncertain state tax positions | 1.4 | 1.1
Other, net | 2.3 | 0.7
Total gross deferred tax assets | 133.8 | 98.8
Less valuation allowance | (40.5) | (35.6)
Total deferred tax assets | 93.3 | 63.2
Deferred tax liabilities: |  |
Intangible assets | 177.7 | 81.1
Total deferred tax liabilities | 177.7 | 81.1
Net deferred tax liability | $ (84.4) | $ (17.9)

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