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Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation |  |  |  |
Share-based compensation expenses capitalized as inventory |  |  | $ 0.9 | $ 0.8
Defined benefit plans |  |  |  |
Net periodic benefit cost | $ 2.4 | $ 2.2 | $ 4.8 | $ 4.5

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