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Reconciliation of the Differences Between Basic and Diluted Earnings Per Share (EPS) (Detail) (JPY ¥) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share, Diluted [Line Items]
Income attributable to ORIX Corporation from continuing operations	¥ 23,746	¥ 13,152	¥ 67,914	¥ 44,178
Effect of dilutive securities-
Expense related to convertible bonds	589	328	1,767	1,801
Income from continuing operations for diluted EPS computation	¥ 24,335	¥ 13,480	¥ 69,681	¥ 45,979
Weighted-average shares	107,511	107,487	107,506	107,487
Effect of dilutive securities-
Conversion of convertible bonds	24,410	21,919	24,411	24,412
Exercise of stock options	112	106	111	92
Weighted-average shares for diluted EPS computation	132,033	129,512	132,028	131,991
Earnings per share for income attributable to ORIX Corporation from continuing operations:
Basic	¥ 220.87	¥ 122.36	¥ 631.72	¥ 411.01
Diluted	¥ 184.31	¥ 104.08	¥ 527.77	¥ 348.35

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Net Income (Loss) Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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