Shareholders' equity (Tables)

12 Months Ended

Mar. 31, 2013

Changes in shares of common stock outstanding

Changes in shares of common stock outstanding are shown below.

	Shares
	Year ended March 31
	2011			2012			2013
Number of shares outstanding at beginning of year		3,669,044,614			3,600,886,932			3,663,483,895
New issue		—			103,429,360			—
Common stock held in treasury:
Repurchases of common stock		(75,030,934	)		(50,093,031	)		(19,209	)
Sales of common stock		2,409			1,530			601
Common stock issued to employees		6,870,600			9,271,600			47,335,900
Other net change in treasury stock		243			(12,496	)		159,065
Number of shares outstanding at end of year		3,600,886,932			3,663,483,895			3,710,960,252