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Income Taxes - Schedule Of Significant Components of Company's Deferred Tax Assets And Liabilities (Detail) - USD ($) $ in Millions | Jun. 30, 2015 | Jun. 30, 2014
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Deferred tax assets: |  |
Net operating loss carryforwards | $ 61.1 | $ 77.0
Property, plant and equipment | 2.9 | 2.9
Accrued vacation | 1.7 | 1.6
Allowance for doubtful accounts | 2.7 | 3.3
Stock compensation expense | 36.8 | 26.0
Research and development credits | 8.9 | 11.2
Uncertain state tax positions | 1.1 | 0.6
Other, net | 0.9 | 0.3
Total gross deferred tax assets | 116.1 | 122.9
Less valuation allowance | (33.4) | (41.4)
Total deferred tax assets | 82.7 | 81.5
Deferred tax liabilities: |  |
Intangible assets | 69.4 | 71.8
Total deferred tax liabilities | 69.4 | 71.8
Net deferred tax assets | 13.3 | 9.7
Current net deferred tax asset | 13.5 | 6.5
Long term net deferred tax asset | (0.2) | 3.2
Net deferred tax assets | $ 13.3 | $ 9.7

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