Employee benefit plans (Tables)

6 Months Ended

Sep. 30, 2016

Employee benefit plans

Net periodic benefit cost for defined benefit plans

	Millions of yen
	Six months  ended September 30
	2015			2016
Service cost	¥	4,120		¥	4,459
Interest cost		1,046			722
Expected return on plan assets		(3,032	)		(3,002	)
Amortization of net actuarial losses		739			1,424
Amortization of prior service cost		(574	)		(574	)
Net periodic benefit cost	¥	2,299		¥	3,029
	Millions of yen
	Three months  ended September 30
	2015			2016
Service cost	¥	2,089		¥	2,098
Interest cost		523			361
Expected return on plan assets		(1,516	)		(1,501	)
Amortization of net actuarial losses		364			712
Amortization of prior service cost		(287	)		(287	)
Net periodic benefit cost	¥	1,173		¥	1,383