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Total Other-Than-Temporary Impairment with Offset for Amount of Total Other-Than-Temporary Impairment Recognized in Other Comprehensive Income (Loss) (Detail) (JPY ¥)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Gain (Loss) on Investments [Line Items]      
Total other-than-temporary impairment losses ¥ 7,992 ¥ 23,180 ¥ 17,100
Portion of loss recognized in other comprehensive income (before taxes) (3) (342) (630)
Net impairment losses recognized in earnings ¥ 7,989 ¥ 22,838 ¥ 16,470