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Restructuring and Asset Impairment Charges - Restructuring Charges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restructuring and Related Activities [Abstract]        
Employee separation charges $ 8 $ 179 $ 101 $ 1,377
Asset impairment and other non-cash charges 0 3 119 346
Restructuring and asset impairment charges $ 8 $ 182 $ 220 $ 1,723