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Defined Benefit Plan Amount Recognized in Accumulated Other Comprehensive Income (Loss), Pre-tax (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Domestic Pension Plans Of Foreign Entity Defined Benefit
    
Defined Benefit Plan Disclosure [Line Items]    
Net prior service credit ¥ 6,014 ¥ 6,530
Net actuarial gain (loss) (18,088) (20,738)
Net transition obligation (194) (247)
Total recognized in accumulated other comprehensive income (loss), pre-tax (12,268) (14,455)
Overseas Pension Plans Defined Benefit
    
Defined Benefit Plan Disclosure [Line Items]    
Net prior service credit 361 0
Net actuarial gain (loss) 695 (1,785)
Net transition obligation (22) (25)
Total recognized in accumulated other comprehensive income (loss), pre-tax ¥ 1,034 ¥ (1,810)