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Property, Plant and Equipment
9 Months Ended
Dec. 31, 2011
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment
Property, Plant and Equipment

Information related to the major categories of our depreciable assets is as follows:
 
 
 
December 31,
2011
 
March 31,
2011
Land and land improvements (1)
 
$
32,629

 
$
30,194

Buildings and leasehold improvements
 
221,249

 
201,883

Machinery and equipment
 
302,210

 
286,103

Information systems
 
107,477

 
101,934

Radioisotope
 
206,470

 
194,882

Construction in progress (1)
 
26,478

 
40,665

Total property, plant, and equipment
 
896,513

 
855,661

Less: accumulated depreciation and depletion
 
(518,348
)
 
(485,259
)
Property, plant, and equipment, net
 
$
378,165

 
$
370,402

(1)
Land is not depreciated. Construction in progress is not depreciated until placed in service.