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Variable Interest Entities - Additional Information (Detail) (Variable Interest Entity, Not Primary Beneficiary, JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
VIEs for acquisition of real estate and real estate development projects for customers
   
Variable Interest Entity [Line Items]    
Additional fund contributed to certain non-consolidated VIEs to support their repayment   ¥ 2,000
VIEs for acquisition of real estate for the Company and its subsidiaries' real estate-related business
   
Variable Interest Entity [Line Items]    
Additional fund contributed to certain non-consolidated VIEs to support their repayment ¥ 0 ¥ 646