Summary of accounting policies (Tables)

12 Months Ended

Mar. 31, 2017

Summary of accounting policies

Breakdown of Office buildings, land, equipment and facilities

	Millions of yen
	March 31
	2016		2017
Land	¥	80,031	¥	78,365
Office buildings		99,400		94,626
Equipment and facilities		27,380		39,062
Software		147,235		137,537
Construction in progress		1,461		106
Total	¥	355,507	¥	349,696

Schedule of estimated useful lives for significant asset classes

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