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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
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)