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Property, Plant and Equipment Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2024
Mar. 31, 2024
Property, Plant and Equipment [Abstract]    
Property, Plant and Equipment
Information related to the major categories of our depreciable assets is as follows:
 September 30,
2024		March 31,
2024
Land and land improvements (1)
$106,008 $90,134 
Buildings and leasehold improvements770,760 724,492 
Machinery and equipment1,148,329 1,075,082 
Information systems260,649 256,671 
Radioisotope732,755 692,642 
Construction in progress (1)
577,443 500,106 
Total property, plant, and equipment3,595,944 3,339,127 
Less: accumulated depreciation and depletion(1,666,278)(1,573,947)
Property, plant, and equipment, net$1,929,666 $1,765,180 
(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] $ 106,008 $ 90,134
Buildings and leasehold improvements 770,760 724,492
Machinery and equipment 1,148,329 1,075,082
Capitalized Computer Hardware/Software, Gross 260,649 256,671
Radioisotope 732,755 692,642
Construction in progress [1] 577,443 500,106
Total property, plant, and equipment 3,595,944 3,339,127
Less: accumulated depreciation and depletion (1,666,278) (1,573,947)
Property, plant, and equipment, net $ 1,929,666 $ 1,765,180
[1] Land is not depreciated. Construction in progress is not depreciated until placed in service.