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Restructuring and other related costs - Restructuring expense (income) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Restructuring and Related Activities [Abstract]    
Gain on sale of property, plant and equipment $ 0 $ (152)
Other costs, including other asset write-offs 96 234
Total $ 96 $ 82