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Goodwill and Other Intangible Assets, Net - Estimated Intangible Asset Amortization Expense (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]      
2021 $ 7,620    
2022 8,073    
2023 7,988    
2024 6,359    
2025 6,029    
Later 29,879    
Amortizable intangibles, net 65,948    
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
2021 4,022    
2022 4,022    
2023 4,022    
2024 4,022    
2025 4,022    
Later 10,821    
Amortizable intangibles, net 30,931 $ 34,953 $ 33,525
Production and Supply Contracts      
Finite-Lived Intangible Assets [Line Items]      
2021 870    
2022 1,397    
2023 1,397    
2024 12    
2025 0    
Later 0    
Amortizable intangibles, net 3,676 4,225 6,119
Internally Developed Software      
Finite-Lived Intangible Assets [Line Items]      
2021 918    
2022 846    
2023 764    
2024 520    
2025 255    
Later 0    
Amortizable intangibles, net 3,303 1,526 984
Licenses      
Finite-Lived Intangible Assets [Line Items]      
2021 1,747    
2022 1,745    
2023 1,742    
2024 1,742    
2025 1,689    
Later 18,999    
Amortizable intangibles, net 27,664 30,640 30,096
Trade Names      
Finite-Lived Intangible Assets [Line Items]      
2021 63    
2022 63    
2023 63    
2024 63    
2025 63    
Later 59    
Amortizable intangibles, net $ 374 $ 437 $ 0