Annual report pursuant to Section 13 and 15(d)

Supplemental Balance Sheets and Statements of Operations Detail Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment Useful Life (Phantom)

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Supplemental Balance Sheets and Statements of Operations Detail Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment Useful Life (Phantom)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 20 years 20 years
Buildings | Minimum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 20 years 20 years
Buildings | Maximum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 40 years 40 years
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 10 years 10 years
Furniture and fixtures | Minimum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 4 years 4 years
Furniture and fixtures | Maximum    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 10 years 10 years