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Property, Plant and Equipment Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2020
Mar. 31, 2020
Property, Plant and Equipment [Abstract]    
Property, Plant and Equipment
Information related to the major categories of our depreciable assets is as follows:
 September 30,
2020		March 31,
2020
Land and land improvements (1)
$67,407 $65,994 
Buildings and leasehold improvements546,273 531,267 
Machinery and equipment722,017 682,488 
Information systems182,104 181,112 
Radioisotope547,395 508,593 
Construction in progress (1)
196,016 159,731 
Total property, plant, and equipment2,261,212 2,129,185 
Less: accumulated depreciation and depletion(1,085,146)(1,017,330)
Property, plant, and equipment, net$1,176,066 $1,111,855 
(1)Land is not depreciated. Construction in progress is not depreciated until placed in service.
  
Property, Plant and Equipment [Line Items]    
Land and land improvements [1] $ 67,407 $ 65,994
Buildings and leasehold improvements 546,273 531,267
Machinery and equipment 722,017 682,488
Radioisotope 547,395 508,593
Construction in progress [1] 196,016 159,731
Total property, plant, and equipment 2,261,212 2,129,185
Less: accumulated depreciation and depletion (1,085,146) (1,017,330)
Property, plant, and equipment, net 1,176,066 1,111,855
Capitalized Computer Hardware/Software, Gross $ 182,104 $ 181,112
[1] Land is not depreciated. Construction in progress is not depreciated until placed in service.