Quarterly report pursuant to Section 13 or 15(d)

Basis of Financial Statement Presentation - ASC 606 Adjustment Statement of Operations (Details)

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Basis of Financial Statement Presentation - ASC 606 Adjustment Statement of Operations (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net sales $ 294,741 $ 350,175 $ 967,380 $ 1,027,024
Operating costs and expenses:        
Cost of sales 201,560 226,425 638,901 694,888
Research and development 12,624 11,357 37,073 33,040
Operating Income (Loss) 28,648 61,616 136,138 146,792
Income tax expense 5,400 2,600 23,900 9,200
Net income (loss) $ 16,602 $ 40,806 $ 41,682 $ 113,167
Net income (loss) per basic share (in usd per share) $ 0.28 $ 0.70 $ 0.71 $ 1.96
Earnings Per Share, Diluted $ 0.28 $ 0.69 $ 0.70 $ 1.91