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Retirement and Pension Plans (Schedule of Change in Benefit Obligations) (Details) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2009
Benefit obligations at beginning of year ¥ 168,974 ¥ 167,277  
Service cost 6,117 5,933 5,944
Interest cost 3,315 3,646 3,730
Actuarial loss (gain) (831) 3,729  
Foreign currency exchange rate changes (363) 549  
Benefit obligations at end of year 165,637 168,974 167,277
Accumulated benefit obligations at March 31 164,942 168,377  
Discount rate 2.60% [1] 2.40% [1]  
Lump-Sum Payments [Member]
     
Benefits paid (7,226) (7,913)  
Annuity Payments [Member]
     
Benefits paid ¥ (4,349) ¥ (4,247)  
[1] The rate of compensation increase is not used in the calculations of benefit obligations under the point-based benefits system.