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Property, Plant and Equipment (Notes)
9 Months Ended
Dec. 31, 2012
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):
 
December 31, 2012
 
March 31, 2012
Land
$
47,102

 
$
46,529

Building and building improvements
395,721

 
374,042

Machinery and equipment
1,365,721

 
1,314,303

Projects in process
76,853

 
83,676

 
1,885,397

 
1,818,550

Less accumulated depreciation and amortization
1,362,660

 
1,301,939

 
$
522,737

 
$
516,611


 
Depreciation expense attributed to property, plant and equipment was $23.0 million and $66.0 million for the three and nine months ended December 31, 2012, respectively, and $21.5 million and $65.5 million for the three and nine months ended December 31, 2011, respectively.