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Defined Benefit Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of components of net periodic benefit (income) costs relating to pension and other postretirement benefit plans
The components of net periodic benefit (income) costs relating to the Company’s pension and other postretirement benefit plans are as follows for the quarters ended September 30, 2017 and 2016 (amounts in thousands):
 
Pension
 
Post-retirement Benefit Plan
 
Quarters Ended September 30,
 
Quarters Ended September 30,
 
2017
 
2016
 
2017
 
2016
Net service cost 
$
1,316

 
$
347

 
$
—

 
$
—

Interest cost
425

 
358

 
3

 
4

Expected return on net assets
(504
)
 
(94
)
 
—

 
—

Amortization:
 

 
 

 
 

 
 

Actuarial (gain) loss
20

 
115

 
(47
)
 
(43
)
Prior service cost
90

 
21

 
—

 
—

Total net periodic benefit (income) costs
$
1,347

 
$
747

 
$
(44
)
 
$
(39
)

The components of net periodic benefit (income) costs relating to the Company’s pension and other postretirement benefit plans are as follows for the six-month periods ended September 30, 2017 and 2016 (amounts in thousands):
 
Pension
 
Post-retirement Benefit Plan
 
Six-Month Periods Ended September 30,
 
Six-Month Periods Ended September 30,
 
2017
 
2016
 
2017
 
2016
Net service cost (1)
$
2,632

 
$
693

 
$
—

 
$
—

Interest cost
850

 
717

 
6

 
8

Expected return on net assets
(1,007
)
 
(188
)
 
—

 
—

Amortization:
 

 
 

 
 

 
 

Actuarial (gain) loss
40

 
230

 
(94
)
 
(85
)
Prior service cost
181

 
42

 
—

 
—

Total net periodic benefit (income) costs
$
2,696

 
$
1,494

 
$
(88
)
 
$
(77
)