Summary of accounting policies (Tables)

12 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Breakdown of Office buildings, land, equipment and facilities

The following table presents a breakdown of owned and leased office buildings, land, equipment and facilities as of March 31, 2019 and 2020.

	Millions of yen
	March 31
	2019		2020
Land	¥	49,474	¥	49,214
Office buildings		103,423		71,468
Equipment and facilities		75,206		36,279
Software		121,245		111,031
Construction in progress		17		1,738
Operating lease ROU assets		—		170,782
Total	¥	349,365	¥	440,512

Schedule of estimated useful lives for significant asset classes

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

Office buildings	3 to 50 years
Equipment and facilities	2 to 20 years
Software	3 to 10 years