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Life Insurance Premiums and Related Investment Income (Detail) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Net Investment Income [Line Items]      
Life insurance premiums ¥ 145,464 ¥ 130,187 ¥ 116,836
Life insurance related investment income 9,942 8,539 10,071
Gains on life insurance premium and related investment income ¥ 155,406 ¥ 138,726 ¥ 126,907