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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2018
Deferred tax assets:    
Accounts receivable $ 1,297 $ 1,790
Inventories 4,081 3,660
Net operating loss carryforwards 48,423 50,928
Accrued expenses 21,574 21,274
Deferred Tax Assets, Deferred Expense, Capitalized Research and Development Costs 7,061 0
Other assets 17,656 16,832
Gross deferred tax assets 100,092 94,484
Less valuation allowance (17,519) (15,255)
Total deferred tax assets 82,573 79,229
Deferred tax liabilities:    
Property, plant and equipment 25,656 21,045
Intangible assets 96,826 46,058
Other liabilities 1,737 1,331
Total deferred tax liabilities 124,219 68,434
Deferred Tax Liabilities, Net $ (41,646)  
Net deferred tax assets   $ 10,795