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Valuation and Qualifying Accounts and Reserves (Detail) (JPY ¥)
In Millions
 12 Months Ended
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2009
Restructuring cost
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period ¥ 113 ¥ 148 ¥ 529
Acquisitions 0 0 0
Addition: Charged to costs and expenses 42 28 250
Deduction (75) (88) (548)
Translation adjustment (2) 25 (83)
Balance at end of period 78 113 148
Restructuring cost | Closed office lease obligations
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 97 148 500
Acquisitions 0 0 0
Addition: Charged to costs and expenses 42 9 202
Deduction (59) (85) (472)
Translation adjustment (2) 25 (82)
Balance at end of period 78 97 148
Restructuring cost | Disposal of equipment
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period   0 0
Acquisitions   0 0
Addition: Charged to costs and expenses   3 28
Deduction   (3) (28)
Translation adjustment   0 0
Balance at end of period   0 0
Restructuring cost | Severance and other benefits to terminated employees
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 16 0 24
Acquisitions 0 0 0
Addition: Charged to costs and expenses 0 16 20
Deduction (16) 0 (44)
Translation adjustment 0 0 0
Balance at end of period 0 16 0
Restructuring cost | Other costs
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period     5
Acquisitions     0
Addition: Charged to costs and expenses     0
Deduction     (4)
Translation adjustment     (1)
Balance at end of period     0
Valuation Allowance of Deferred Tax Assets
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 42,846 [1] 44,635 [1] 41,565 [1]
Acquisitions 669 [1] 100 [1] 1,351 [1]
Addition: Charged to costs and expenses 6,220 [1] 3,501 [1] 7,743 [1]
Deduction (22,778) [1] (5,448) [1] (5,059) [1]
Translation adjustment (163) [1] 58 [1] (965) [1]
Balance at end of period ¥ 26,794 [1] ¥ 42,846 [1] ¥ 44,635 [1]
[1] The amount of deduction includes reductions of goodwill, expiry of loss carryforwards and sales of subsidiary.