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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Jun. 30, 2018
Deferred tax assets:    
Net operating loss carryforwards $ 85.7 $ 44.6
Property, plant and equipment   1.1
Accrued vacation 1.2 1.4
AR allowance 3.3 10.7
Stock compensation expense 16.0 17.0
Research and development credits 25.4 13.0
Uncertain state tax positions 1.3 1.3
Other, net 9.0 0.9
Total gross deferred tax assets 141.9 90.0
Less valuation allowance (38.9) (37.8)
Total deferred tax assets 103.0 52.2
Deferred tax liabilities:    
Intangible assets 175.4 109.5
Property, plant and equipment 2.5  
Deferred revenue 7.7  
Total deferred tax liabilities 185.6 109.5
Net deferred tax liability $ (82.6) $ (57.3)