Summary of accounting policies (Tables)

12 Months Ended

Mar. 31, 2013

Breakdown of office buildings, land, equipment and facilities

The following table presents a breakdown of Office buildings, land, equipment and facilities as of March 31, 2012 and 2013.

	Millions of yen
	March 31
	2012		2013
Land	¥	594,146	¥	93,800
Office buildings		235,995		104,320
Equipment and facilities		60,840		52,644
Software		141,069		161,469
Construction in progress		13,900		16,008
Total	¥	1,045,950	¥	428,241

Schedule of estimated useful lives for significant asset classes

The estimated useful lives for significant asset classes are as follows:

Office buildings	5 to 50 years
Equipment and facilities	2 to 20 years
Software	Up to 5 years