Annual report pursuant to Section 13 and 15(d)

(Gain) Loss on Write-Down and Disposal of Long-Lived Assets Impairment Charges (Phantom)

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(Gain) Loss on Write-Down and Disposal of Long-Lived Assets Impairment Charges (Phantom) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Property, Plant and Equipment [Line Items]      
Asset Impairment Charges $ 1,000,000 $ 184,000 $ 10,300,000
Write down of long-lived assets