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Rent Expenses
12 Months Ended
Mar. 31, 2011
Rent Expenses [Abstract]  
Rent Expenses
16. Rent Expenses
Komatsu leases office space and equipment and employee housing under cancelable and non-cancelable lease agreements. Rent expenses under cancelable and non-cancelable operating leases amounted to ¥14,480 million ($174,458 thousand), ¥13,823 million and ¥14,625 million, respectively, for the years ended March 31, 2011, 2010 and 2009. At March 31, 2011, the future minimum lease payments under non-cancelable operating leases and capital leases are as follows:
                         
    Millions of yen  
    Capital     Operating lease        
Year ending March 31   leases     commitments     Total  
2012
  ¥ 25,474     ¥ 3,240     ¥ 28,714  
2013
    14,557       2,129       16,686  
2014
    7,859       1,504       9,363  
2015
    1,189       1,000       2,189  
2016
    1,117       613       1,730  
Thereafter
    159       1,550       1,709  
 
                 
Total minimum lease payments
  ¥ 50,355     ¥ 10,036     ¥ 60,391  
 
                 
Less: amounts representing interest
    (1,829 )                
 
                     
Present value of net minimum capital lease payments
  ¥ 48,526