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Property, Plant and Equipment (Tables)
6 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consists of the following (amounts in thousands):
 
September 30, 2013
 
March 31, 2013
Land
$
55,464

 
$
47,102

Building and building improvements
395,971

 
396,611

Machinery and equipment
1,421,806

 
1,377,814

Projects in process
69,753

 
76,158

 
1,942,994

 
1,897,685

Less accumulated depreciation and amortization
1,424,803

 
1,383,141

 
$
518,191

 
$
514,544