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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
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