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Inventories
 12 Months Ended
Mar. 31, 2011
Inventories [Abstract]  
INVENTORIES
5.   INVENTORIES
    The components of inventories as of March 31, 2011 and 2010 were as follows:
                         
                    Thousands of  
    Millions of Yen     U.S. Dollars  
    2011     2010     2011  
 
                       
Finished products
  ¥ 26,576     ¥ 27,752     $ 321,121  
Work in process
    3,300       3,263       39,874  
Raw materials
    1,080       1,088       13,050  
 
                 
 
                       
Total
  ¥ 30,956     ¥ 32,103     $ 374,045