Japan Gaap - Amount available as of the balance sheet date for dividend payments after computation of statutory restrictions on capital surplus.

Name:	ix_JapanGaapStatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
Namespace Prefix:	ix
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Stockholders Equity Note [Line Items]

+ Details

Name:	ix_StockholdersEquityNoteLineItems
Namespace Prefix:	ix
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Transfer to retained earnings appropriated for legal reserve

+ Details

Name:	ix_TransferToRetainedEarningsAppropriatedForLegalReserve
Namespace Prefix:	ix
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

If the restricted net assets (as defined) of consolidated and unconsolidated subsidiaries and the parent's equity in the undistributed earnings of 50 percent-or-less-owned persons accounted for by the equity method together exceeds 25 percent of consolidated net assets as of the end of the most recently completed fiscal year, separately provide the amount of such restricted net asset for consolidated and unconsolidated subsidiaries as of the end of the most recently completed fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph e
-Subparagraph 3
-Article 4

+ Details

Name:	us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The aggregate amount of dividends declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

+ Details

Name:	us-gaap_DividendsPayableAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The month and year (YYYY-MM) that the dividend to be paid was declared.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

+ Details

Name:	us-gaap_DividendsPayableDateDeclaredMonthAndYear
Namespace Prefix:	us-gaap
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	instant

- Definition

The date as of when a holder must own the stock to be entitled to the dividend. The ex-dividend date is generally 3 days before the record date.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. Such amount typically reflects adjustments similar to those made in preparing consolidated statements, including adjustments to eliminate intercompany gains and losses, and to amortize, if appropriate, any difference between cost and underlying equity in net assets of the investee at the date of investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 19
-Subparagraph c

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 7

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 9
-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 18
-Paragraph 6
-Subparagraph b

+ Details

Name:	us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percent of net assets of the aggregate value of all restricted investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12C
-Paragraph 9
-Subparagraph c
-Article 12

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Paragraph 6
-Subparagraph c
-Article 12

+ Details

Name:	us-gaap_RestrictedInvestmentsPercentOfNetAssets
Namespace Prefix:	us-gaap
Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of new stock issued during the period.

+ References

+ Details

Name:	us-gaap_StockIssuedDuringPeriodValueNewIssues
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7
-Subparagraph b

+ Details

Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Value of common and preferred stock retired from treasury during the period. This element is used only when Treasury Stock is accounted for at total cost versus par.

+ References

+ Details

Name:	us-gaap_TreasuryStockValueRetiredCostMethod
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

ORIX Corporation Shareholders' Equity - Additional Information (Detail) In Millions, except Share data, unless otherwise specified	12 Months Ended														12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)	Mar. 31, 2011 Common Stock	Mar. 31, 2010 Common Stock JPY (¥)	Mar. 31, 2009 Common Stock	Mar. 31, 2010 Additional Paid-in Capital JPY (¥)	Mar. 31, 2009 Additional Paid-in Capital JPY (¥)	Mar. 31, 2011 Retained Earnings USD ($)	Mar. 31, 2011 Retained Earnings JPY (¥)	Mar. 31, 2010 Retained Earnings JPY (¥)	Mar. 31, 2009 Retained Earnings JPY (¥)	Mar. 31, 2011 Maximum	Mar. 31, 2009 Flexible Capital Policy JPY (¥)	Mar. 31, 2009 Merger Of Consolidated Subsidiary JPY (¥)
Stockholders Equity Note [Line Items]
Dividends to be distributed to shareholders	$ 103	¥ 8,599
Declared date of dividends to be distributed to shareholders	2011-05	2011-05
Record date of dividends to be distributed to shareholders	Mar. 31, 2011	Mar. 31, 2011
Legal reserve reclassified to retained earnings				2,220
Issuance of common stock, shares					0	18,000,000	0
Issuance of common stock			83,024			41,677		41,347
Amount available for dividends under the Japanese Companies Act	2,904	241,449
Restricted net assets of certain subsidiaries which include regulatory capital requirements for life insurance and banking operations	567	47,121
Equity in undistributed earnings of the companies accounted for by the equity method	202	16,806	8,364	(40,458)						334	27,812
Restricted net assets of certain subsidiaries, percentage to consolidated net assets														25.00%
Treasury stocks acquired	1	70	3	29,294											29,290
Treasury stocks disposed			¥ 291	¥ 1,595					¥ (533)			¥ (531)	¥ (9,915)			¥ 12,013