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Net Pension Cost of Defined Benefit Plans (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Domestic Pension Plans Of Foreign Entity Defined Benefit
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost ¥ 3,305 ¥ 3,173 ¥ 3,015
Interest cost 1,128 1,063 1,140
Expected return on plan assets (2,034) (1,826) (1,823)
Amortization of transition obligation 53 53 53
Amortization of net actuarial loss 777 1,447 1,175
Amortization of prior service credit (1,259) (1,168) (1,193)
Net periodic pension cost 1,970 2,742 2,367
Overseas Pension Plans Defined Benefit
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,654 41 34
Interest cost 1,684 189 199
Expected return on plan assets (2,389) (223) (196)
Amortization of transition obligation 3 3 3
Amortization of net actuarial loss 60 49 43
Amortization of prior service credit (3) 0 0
Net periodic pension cost ¥ 1,009 ¥ 59 ¥ 83