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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Jun. 30, 2015
Deferred tax assets:    
Net operating loss carryforwards $ 54.4 $ 61.1
Property, plant and equipment 1.8 2.9
Accrued vacation 2.0 1.7
Allowance for doubtful accounts 2.4 2.7
Stock compensation expense 27.0 36.8
Research and development credits 9.4 8.9
Uncertain state tax positions 1.1 1.1
Other, net 0.7 0.9
Total gross deferred tax assets 98.8 116.1
Less valuation allowance (35.6) (33.4)
Total deferred tax assets 63.2 82.7
Deferred tax liabilities:    
Intangible assets 81.1 69.4
Total deferred tax liabilities 81.1 69.4
Net deferred tax asset   13.3
Net deferred tax liability (17.9)  
Current net deferred tax asset 0.0 13.5
Long term net deferred tax liability (17.9) (0.2)
Net deferred tax asset   $ 13.3
Net deferred tax liability $ (17.9)