CONSOLIDATED STATEMENTS OF CASH FLOWS (JPY ¥) In Millions, unless otherwise specified	6 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	¥ 74,388us-gaap_ProfitLoss	¥ 104,647us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	37,566us-gaap_DepreciationAndAmortization	39,853us-gaap_DepreciationAndAmortization
Gain on investments in equity securities	(9,234)us-gaap_GainLossOnInvestments	(12,889)us-gaap_GainLossOnInvestments
Deferred income taxes	19,918us-gaap_DeferredIncomeTaxExpenseBenefit	9,523us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:
Time deposits	143,036	141,920
Deposits with stock exchanges and other segregated cash	(49,499)	(106,007)
Trading assets and private equity investments	(775,733)	(803,462)
Trading liabilities	(395,689)	1,131,663
Securities purchased under agreements to resell, net of securities sold under agreements to repurchase	907,217	224,006
Securities borrowed, net of securities loaned	(34,750)	(232,396)
Other secured borrowings	(75,485)	11,732
Loans and receivables, net of allowance for doubtful accounts	9,322us-gaap_IncreaseDecreaseInReceivables	(161,064)us-gaap_IncreaseDecreaseInReceivables
Payables	150,424	347,701
Bonus accrual	(53,295)	(37,128)
Accrued income taxes, net	16,987	(16,873)
Other, net	66,521	(236,432)
Net cash provided by operating activities	31,694	404,794
Cash flows from investing activities:
Payments for purchases of office buildings, land, equipment and facilities	(72,612)	(114,549)
Proceeds from sales of office buildings, land, equipment and facilities	41,768	94,214
Payments for purchases of investments in equity securities	(102)	(100)
Proceeds from sales of investments in equity securities	4,735	2,304
Decrease (increase) in loans receivable at banks, net	(12,464)	3,918
Decrease (increase) in non-trading debt securities, net	68,663	(88,042)
Other, net	(6,411)	4,146
Net cash provided by (used in) investing activities	23,577	(98,109)
Cash flows from financing activities:
Increase in long-term borrowings	1,211,301	1,112,884
Decrease in long-term borrowings	(1,188,488)us-gaap_RepaymentsOfLongTermDebt	(947,062)us-gaap_RepaymentsOfLongTermDebt
Increase (decrease) in short-term borrowings, net	(5,168)	59,590
Decrease in deposits received at banks, net	(53,645)us-gaap_IncreaseDecreaseInDeposits	(1,891)us-gaap_IncreaseDecreaseInDeposits
Proceeds from sales of common stock held in treasury	78us-gaap_ProceedsFromSaleOfTreasuryStock	288us-gaap_ProceedsFromSaleOfTreasuryStock
Payments for repurchases of common stock held in treasury	(65,199)	(32,493)
Payments for cash dividends	(33,469)us-gaap_PaymentsOfDividends	(22,285)us-gaap_PaymentsOfDividends
Net cash provided by (used in) financing activities	(134,590)	169,031
Effect of exchange rate changes on cash and cash equivalents	29,313	17,240
Net increase (decrease) in cash and cash equivalents	(50,006)	492,956
Cash and cash equivalents at beginning of the year	1,489,792	805,087
Cash and cash equivalents at end of period	1,439,786	1,298,043
Cash paid during the year for-
Interest	170,522us-gaap_InterestPaid	154,025us-gaap_InterestPaid
Income tax payments, net	¥ 14,386us-gaap_IncomeTaxesPaidNet	¥ 88,855us-gaap_IncomeTaxesPaidNet

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash flow from purchases followed by sales of securities under terms of reverse repurchase agreements.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

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-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

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-Paragraph 1A

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-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration