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Funded Status of Defined Benefit Pension 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
      
Change in benefit obligation:      
Benefit obligation at beginning of year ¥ 64,112 ¥ 59,261  
Service cost 3,305 3,173 3,015
Interest cost 1,128 1,063 1,140
Actuarial loss (gain) 1,956 (221)  
Foreign currency exchange rate change 0 0  
Benefits paid (2,423) (2,281)  
Business combinations 15,649 3,117  
Plan amendments (743) 0  
Benefit obligation at end of year 82,984 64,112 59,261
Change in plan assets:      
Fair value of plan assets at beginning of year 93,144 82,905  
Actual return on plan assets 5,736 8,919  
Employer contribution 2,717 2,502  
Benefits paid (2,324) (2,187)  
Business combinations 5,711 1,005  
Foreign currency exchange rate change 0 0  
Fair value of plan assets at end of year 104,984 93,144 82,905
The funded status of the plans 22,000 29,032  
Amount recognized in the consolidated balance sheets consists of:      
Prepaid benefit cost included in prepaid expenses 34,910 32,005  
Accrued benefit liability included in accrued expenses (12,910) (2,973)  
Net amount recognized 22,000 29,032  
Overseas Pension Plans Defined Benefit
      
Change in benefit obligation:      
Benefit obligation at beginning of year 5,368 4,458  
Service cost 1,654 41 34
Interest cost 1,684 189 199
Actuarial loss (gain) (1,215) 236  
Foreign currency exchange rate change 3,848 656  
Benefits paid (1,203) (212)  
Business combinations 59,048 0  
Plan amendments (344) 0  
Benefit obligation at end of year 68,840 5,368 4,458
Change in plan assets:      
Fair value of plan assets at beginning of year 3,825 3,040  
Actual return on plan assets 3,783 370  
Employer contribution 1,929 89  
Benefits paid (976) (150)  
Business combinations 50,001 0  
Foreign currency exchange rate change 3,480 476  
Fair value of plan assets at end of year 62,042 3,825 3,040
The funded status of the plans (6,798) (1,543)  
Amount recognized in the consolidated balance sheets consists of:      
Prepaid benefit cost included in prepaid expenses 9 0  
Accrued benefit liability included in accrued expenses (6,807) (1,543)  
Net amount recognized ¥ (6,798) ¥ (1,543)