Earnings per share (Tables)

12 Months Ended

Mar. 31, 2020

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
	2018		2019			2020
Basic—
Net income (loss) attributable to NHI shareholders	¥	219,343	¥	(100,442	)	¥	216,998
Weighted average number of shares outstanding		3,474,593,441		3,359,564,840			3,202,369,845
Net income (loss) attributable to NHI shareholders per share	¥	63.13	¥	(29.90	)	¥	67.76
Diluted—
Net income (loss) attributable to NHI shareholders	¥	219,266	¥	(100,525	)	¥	216,890
Weighted average number of shares outstanding		3,543,602,532		3,359,566,740			3,276,510,404
Net income (loss) attributable to NHI shareholders per share	¥	61.88	¥	(29.92	)	¥	66.20