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Discontinued Operations - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended						9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Subsidiaries	Jun. 30, 2011 Subsidiaries	Dec. 31, 2010 Subsidiaries	Sep. 30, 2010 Subsidiaries	Dec. 31, 2011 Real Estate	Dec. 31, 2010 Real Estate	Dec. 31, 2011 Real Estate	Dec. 31, 2010 Real Estate	Mar. 31, 2011 Real Estate
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sales of subsidiaries and business units	¥ 1,980	¥ 5,919	¥ 3,900	¥ 11,185	¥ 377	¥ 162	¥ 5,896	¥ 263
Gain (loss) on liquidation of subsidiaries and business units					(37)		33
Gains (losses) on sales of real estate properties									1,640	(10)	3,398	4,993
Rental properties held for sale									¥ 22,820		¥ 22,820		¥ 27,486

X

- Definition

Discontinued Operation Liquidation Gain Loss

+ References

No definition available.

+ Details

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- Definition

Gain (loss) after tax expense (benefit), not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 43



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-Subparagraph b

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- Definition

The net gain or loss arising from the lessor's sale of assets held- or available-for-lease under contractual arrangements classified as operating leases.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 20, 21

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- Definition

Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity.

+ References

No definition available.

+ Details

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