- Definition

For the disposal group, including a component of the entity (discontinued operation), cash includes currency on hand as well as demand deposits with banks or financial institutions. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

Discontinued Operations - Additional Information (Detail) In Millions	12 Months Ended
	Mar. 31, 2011 USD ($)	Mar. 31, 2011 JPY (¥)	Mar. 31, 2010 JPY (¥)	Mar. 31, 2009 JPY (¥)	Mar. 31, 2011 Subsidiaries USD ($)	Mar. 31, 2011 Subsidiaries JPY (¥)	Mar. 31, 2010 Subsidiaries JPY (¥)	Mar. 31, 2009 Subsidiaries JPY (¥)	Mar. 31, 2011 Real Estate USD ($)	Mar. 31, 2011 Real Estate JPY (¥)	Mar. 31, 2010 Real Estate JPY (¥)	Mar. 31, 2009 Real Estate JPY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gains on sales of subsidiaries and business units	$ 173	¥ 14,393	¥ 14,056	¥ 19,653	$ 83	¥ 6,895	¥ 2,810	¥ 2
Disposal group, trade notes, accounts payable and other liabilities	1	86
Disposal group, cash and cash equivalents	0	4
Gains on sales of real estate properties	120	9,968	7,552	11,426					90	7,498	11,246	19,651
Rental properties held for sale									$ 331	¥ 27,486	¥ 31,611