Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 95 $ 90
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense 85 7
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction [1] (80) (2)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 100 95
SEC Schedule, 12-09, Reserve, Inventory [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 3,562 8,458
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense 564 1,213
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction [2] (1,345) (6,109)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 2,781 3,562
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 37,103 52,190
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense 1,668 [3] 0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction 0 (15,087) [3]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 38,771 37,103
Sales Returns and Allowances [Member]    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount 51 82
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense 341 329
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction (145) (360)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount $ 247 $ 51
[1] Accounts written off, including early pay discounts, net of recoveries.
[2] Inventory loss charged against inventory reserves.
[3] Change in valuation allowance due to assessment of realizability of deferred tax assets and in fiscal year 2018 the impact of the Tax Act.