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Property, Plant and Equipment
6 Months Ended
Sep. 30, 2011
Property, Plant and Equipment [Abstract] 
Property, Plant and Equipment
7. Property, Plant and Equipment
Property, plant and equipment are carried at cost. Depreciation is calculated using the straight-line method over the estimated useful lives of each asset. Estimated useful lives for significant classes of assets are as follows: buildings and improvements 10 to 39 years, and machinery and equipment 3 to 25 years. Repairs and maintenance charges are expensed as incurred. Property, plant and equipment consist of the following (in thousands):
                 
    September 30,     March 31,  
    2011     2011  
Property, plant and equipment, at cost:
               
Land
  $ 20,036     $ 16,046  
Buildings and improvements
    26,839       19,672  
Machinery and equipment
    15,803       11,453  
 
           
 
    62,678       47,171  
Accumulated depreciation
    (12,168 )     (11,178 )
 
           
Property, plant and equipment, net
  $ 50,510     $ 35,993