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Basis of Presentation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Apr. 30, 2020
Jun. 30, 2019
Basis Of Presentation [Line Items]              
Net gain (loss) on foreign currency transactions   $ (0.1) $ (0.1)   $ (0.7)    
Purchase price included in cash       $ 2.5      
Assets acquired accrued Contingent Consideration   1.3   1.3      
Research and development expenses       3.7      
Liabilities recorded in acquisition   1.5   $ 1.5      
Period for amount payable upon meeting milestones       December 2021 through December 2023      
Long-term deferred tax asset   0.3   $ 0.3      
Current assets held for sale   12.5   12.5      
Non-current assets held for sale   17.6   17.6      
Inventories   95.5   95.5     $ 158.7
Asset Purchase Agreement [Member]              
Basis Of Presentation [Line Items]              
Cash consideration receivable on divestiture of business $ 120.0         $ 120.0  
Percentage of purchase price of inventory 5.00%            
Business divestiture closing April 2020            
Assets held for sale   30.1   30.1      
Current assets held for sale   12.5   12.5      
Non-current assets held for sale   17.6   17.6      
Inventories $ 19.4            
Contingent Consideration Milestones Payable Dates from December 2021 through December 2023 [Member]              
Basis Of Presentation [Line Items]              
Purchase price in contingent consideration   $ 6.5   6.5      
Maximum [Member]              
Basis Of Presentation [Line Items]              
Net gain (loss) on foreign currency transactions       $ 0.1