Annual report pursuant to Section 13 and 15(d)

Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment (Details)

v3.20.1
Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,469,491 $ 1,375,731
Accumulated depreciation (916,855) (880,451)
Property, plant and equipment 552,636 495,280
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 56,340 62,232
Buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 210,192 199,319
Machinery and equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 977,806 916,737
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 109,770 82,306
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 104,842 105,857
Other    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 10,541 $ 9,280