Summary of accounting policies (Tables)

12 Months Ended

Mar. 31, 2021

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, 2020 and 2021.

	Millions of yen
	March 31
	2020		2021
Land	¥	49,214	¥	39,233
Office buildings		71,468		76,725
Equipment and facilities		36,279		59,614
Software		111,031		103,385
Construction in progress		1,738		407
Operating lease ROU assets		170,782		185,085
Total	¥	440,512	¥	464,449

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