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Commitments and Contingent Liabilities (Tables)
 12 Months Ended
Mar. 31, 2011
Commitments and Contingent Liabilities (Tables) [Abstract]  
Accrued Product Warranty
                         
    2011     2010     2011  
Balance at beginning of year
  ¥ 23,758     ¥ 28,256     $ 286,241  
Addition
    27,091       21,149       326,398  
Utilization
    (21,352 )     (25,477 )     (257,253 )
Other
    (966 )     (170 )     (11,639 )
 
                 
Balance at end of year
  ¥ 28,531     ¥ 23,758     $ 343,747