Earnings per share (Tables)

12 Months Ended

Mar. 31, 2019

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
	2017		2018		2019
Basic—
Net income (loss) attributable to NHI shareholders	¥	239,617	¥	219,343	¥	(100,442	)
Weighted average number of shares outstanding		3,560,775,652		3,474,593,441		3,359,564,840
Net income (loss) attributable to NHI shareholders per share	¥	67.29	¥	63.13	¥	(29.90	)
Diluted—
Net income (loss) attributable to NHI shareholders	¥	239,475	¥	219,266	¥	(100,525	)
Weighted average number of shares outstanding		3,647,729,909		3,543,602,532		3,359,566,740
Net income (loss) attributable to NHI shareholders per share	¥	65.65	¥	61.88	¥	(29.92	)