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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.

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- Definition Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, charged to costs and expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, acquired in a business combination + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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