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Amounts Due under Non Cancelable Contracts (Detail) (JPY ¥)
In Millions, unless otherwise specified
Dec. 31, 2011
Mar. 31, 2011
Commitments and Contingencies Disclosure [Line Items]    
Within one year ¥ 160 ¥ 382
More than one year 268 60
Total ¥ 428 ¥ 442