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Valuation and Qualifying Accounts and Reserves (Detail) (JPY ¥)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Restructuring cost
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period ¥ 9 ¥ 39 ¥ 78
Acquisitions 3,049 0 0
Addition: Charged to costs and expenses 0 3 15
Deduction (1,230) (34) (53)
Translation adjustment 104 1 (1)
Balance at end of period 1,932 9 39
Restructuring cost | Closed office lease obligations
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 9 39 78
Acquisitions 0 0 0
Addition: Charged to costs and expenses 0 0 0
Deduction (9) (31) (38)
Translation adjustment 0 1 (1)
Balance at end of period 0 9 39
Restructuring cost | Severance and other benefits to terminated employees
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 0 0 0
Acquisitions 3,049 0 0
Addition: Charged to costs and expenses 0 3 15
Deduction (1,221) (3) (15)
Translation adjustment 104 0 0
Balance at end of period 1,932 0 0
Valuation Allowance of Deferred Tax Assets
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 18,831 24,138 26,794
Acquisitions 10,453 1,085 875
Addition: Charged to costs and expenses 3,300 4,973 6,339
Deduction (3,964) [1] (12,116) [1] (6,836) [1]
Other 49 [2] 751 [2] (3,034) [2]
Balance at end of period ¥ 28,669 ¥ 18,831 ¥ 24,138
[1] The amount of deduction includes benefits recognized in earnings, expiry of loss carryforwards and sales of subsidiaries.
[2] The amount of other includes translation adjustment and the effect of changes in statutory tax rate.