Other comprehensive income (loss) (Tables)

12 Months Ended

Mar. 31, 2017

Accumulated other comprehensive income (loss)

Changes in accumulated other comprehensive income (loss)

	Millions of yen
	For the year ended March 31, 2016
	Balance at beginning of  year			Other comprehensive income (loss) before reclassifications			Reclassifications out of accumulated other comprehensive  income (loss)			Net change during  the year			Balance at end of year
Cumulative translation adjustments	¥	133,371		¥	(79,108	)	¥	(845	)	¥	(79,953	)	¥	53,418
Pension liability adjustment		(15,404	)		(18,097	)		176			(17,921	)		(33,325	)
Net unrealized gain on non-trading securities		25,772			363			(1,248	)		(885	)		24,887
Total	¥	143,739		¥	(96,842	)	¥	(1,917	)	¥	(98,759	)	¥	44,980

	Millions of yen
	For the year ended March 31, 2017
	Balance at beginning of year			Cumulative effect of change in accounting principle		Other comprehensive income (loss) before reclassifications			Reclassifications out of accumulated other comprehensive income (loss)			Net change during the year			Balance at end of year
Cumulative translation adjustments	¥	53,418		¥	—	¥	(4,005	)	¥	(1,646	)	¥	(5,651	)	¥	47,767
Pension liability adjustment		(33,325	)		—		(9,147	)		1,452			(7,695	)		(41,020	)
Net unrealized gain on non-trading securities		24,887			—		(3,948	)		(595	)		(4,543	)		20,344
Own credit adjustments		—			19,294		(12,147	)		(586	)		6,561			6,561
Total	¥	44,980		¥	19,294	¥	(29,247	)	¥	(1,375	)	¥	(11,328	)	¥	33,652

Reclassifications out of accumulated other comprehensive income (loss)

	Millions of yen
	For the year ended March 31
	2016			2017			Affected line items in consolidated statements of income
	Reclassifications out  of accumulated other comprehensive income (loss)			Reclassifications out of accumulated other comprehensive income (loss)
Cumulative translation adjustments:
	¥	845		¥	1,646		Revenue—Other
		—			—		Income tax expense
		845			1,646		Net income
		—			—		Net income attributable to noncontrolling interests
	¥	845		¥	1,646		Net income attributable to NHI shareholders
	Millions of yen
	For the year ended March 31
	2016			2017			Affected line items in consolidated statements of income
	Reclassifications out  of accumulated other comprehensive income (loss)			Reclassifications out of accumulated other comprehensive income (loss)
Pension liability adjustment
	¥	(255	)	¥	(2,118	)	Non-interest expenses—Compensation and benefits
		79			666		Income tax expense
		(176	)		(1,452	)	Net income
		—			—		Net income attributable to noncontrolling interests
	¥	(176	)	¥	(1,452	)	Net income attributable to NHI shareholders

	Millions of yen
	For the year ended March 31
	2016			2017			Affected line items in consolidated statements of income
	Reclassifications out of accumulated other comprehensive income  (loss)			Reclassifications out of accumulated other comprehensive income (loss)
Net unrealized gain on non-trading securities:
	¥	2,724		¥	2,086		Revenue—Other
		(1,081	)		(1,306	)	Income tax expense
		1,643			780		Net income
		(395	)		(185	)	Net income attributable to noncontrolling interests
	¥	1,248		¥	595		Net income attributable to NHI shareholders