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Revenues and Expenses from Asset Management and Servicing (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]      
Management fee income ¥ 111,970 ¥ 8,181 ¥ 9,297
Performance fee income 5,956 6,962 3,528
Other 8,566 122 83
Revenues from asset management and servicing 126,492 15,265 12,908
Distribution fee expenses 14,767 324 172
Sub-advisory fee expenses 19,483 259 309
Other 1,900 10 12
Expenses from asset management and servicing ¥ 36,150 ¥ 593 ¥ 493