Earnings per share (Tables)

12 Months Ended

Mar. 31, 2021

Earnings Per Share [Abstract]

Summary of amounts and numbers used in calculation of net income attributable to NHI shareholders per share (basic and diluted)

	Millions of yen except per share data presented in yen
	Year ended March 31
	2019			2020		2021
Basic—
Net income (loss) attributable to NHI shareholders	¥	(100,442	)	¥	216,998	¥	153,116
Weighted average number of shares outstanding		3,359,564,840			3,202,369,845		3,055,525,640
Net income (loss) attributable to NHI shareholders per share	¥	(29.90	)	¥	67.76	¥	50.11
Diluted—
Net income (loss) attributable to NHI shareholders	¥	(100,525	)	¥	216,890	¥	153,064
Weighted average number of shares outstanding		3,359,566,740			3,276,510,404		3,147,338,609
Net income (loss) attributable to NHI shareholders per share	¥	(29.92	)	¥	66.20	¥	48.63