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Depreciation and Various Expenses (Insurance, Property Tax and Other) of Operating Leases (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)
Schedule of Operating Leases [Line Items]
Depreciation expenses	$ 1,632	¥ 135,712	¥ 138,165	¥ 140,431
Various expenses	637	52,959	53,008	52,506
Costs of operating leases	$ 2,269	¥ 188,671	¥ 191,173	¥ 192,937

X

- Definition

Operating Leases, Income Statement, Other Expenses

+ Details

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X

- Definition

Schedule of Operating Leases [Line Items]

+ Details

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X

- Definition

Costs incurred and are directly related to generating revenues from leased and rented property or equipment.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
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X

- Definition

The total depreciation charge recorded for property subject to or held for lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 5

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