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Reconciliation of Differences between Tax Provision Computed and Consolidated Provisions for Income Taxes (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Reconciliation of Provision of Income Taxes [Line Items] |  |  |  |  |  |
Income before income taxes and discontinued operations | ¥ 283,726 | [1] | ¥ 172,572 | [1] | ¥ 127,515 | [1]
Tax provision computed at statutory rate | 108,667 |  | 66,095 |  | 52,154 |
Increases (reductions) in taxes due to: |  |  |  |  |  |
Change in valuation allowance | (17) |  | (3,371) |  | 3,921 |
Non-deductible expenses for tax purposes | 2,382 |  | 1,538 |  | 1,335 |
Non-taxable income for tax purposes | (3,224) |  | (2,128) |  | (2,852) |
Effect of lower tax rates on foreign subsidiaries and a domestic life insurance subsidiary | (5,805) |  | (4,720) |  | (6,821) |
Effect of the new Japanese tax law | (5,775) |  | (580) |  | (7,137) |
Other, net | 1,008 |  | (3,152) |  | 4,008 |
Provision for income taxes | ¥ 97,236 |  | ¥ 53,682 |  | ¥ 44,608 |
[1] | Results of discontinued operations before applicable tax effect are included in each amount attributed to each geographic area.

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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