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Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 73.1 $ 85.7
Property, plant and equipment 37.2  
Accrued vacation 1.5 1.2
AR allowance 1.2 3.3
Stock compensation expense 13.8 16.0
Research and development credits 27.6 25.4
Lease right-of-use asset 16.3  
Uncertain state tax positions 1.6 1.3
Other, net 9.6 9.0
Total gross deferred tax assets 181.9 141.9
Less valuation allowance (42.4) (38.9)
Total deferred tax assets 139.5 103.0
Deferred tax liabilities:    
Intangible assets 150.3 175.4
Lease liability 15.8  
Property, plant and equipment   2.5
Deferred revenue   7.7
Total deferred tax liabilities 166.1 185.6
Net deferred tax liability $ (26.6) $ (82.6)