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Property, Plant and Equipment Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2021
Mar. 31, 2021
Property, Plant and Equipment [Abstract]    
Property, Plant and Equipment
Information related to the major categories of our depreciable assets is as follows:
 September 30,
2021		March 31,
2021
Land and land improvements (1)
$83,479 $69,477 
Buildings and leasehold improvements678,945 567,132 
Machinery and equipment883,897 779,044 
Information systems225,890 193,222 
Radioisotope579,617 565,681 
Construction in progress (1)
282,313 211,381 
Total property, plant, and equipment2,734,141 2,385,937 
Less: accumulated depreciation and depletion(1,222,886)(1,150,537)
Property, plant, and equipment, net$1,511,255 $1,235,400 
(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] $ 83,479 $ 69,477
Buildings and leasehold improvements 678,945 567,132
Machinery and equipment 883,897 779,044
Radioisotope 579,617 565,681
Construction in progress [1] 282,313 211,381
Total property, plant, and equipment 2,734,141 2,385,937
Less: accumulated depreciation and depletion (1,222,886) (1,150,537)
Property, plant, and equipment, net 1,511,255 1,235,400
Capitalized Computer Hardware/Software, Gross $ 225,890 $ 193,222
[1] Land is not depreciated. Construction in progress is not depreciated until placed in service.