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Property, Plant and Equipment (Notes)
6 Months Ended
Sep. 30, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant and Equipment

Property, plant and equipment consists of the following (amounts in thousands):
 
September 30, 2014
 
March 31, 2014
Land
$
69,895

 
$
55,624

Building and building improvements
418,525

 
411,149

Machinery and equipment
1,538,405

 
1,465,255

Projects in process
73,955

 
68,991

 
2,100,780

 
2,001,019

Less accumulated depreciation and amortization
1,515,678

 
1,469,052

 
$
585,102

 
$
531,967


 
Depreciation expense attributed to property, plant and equipment was $24.3 million and $47.6 million for the three and six months ended September 30, 2014, respectively, and $23.0 million and $44.4 million for the three and six months ended September 30, 2013, respectively.