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Accumulated Other Comprehensive Loss (Tables)
6 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of accumulated other comprehensive loss
The following table shows the changes in accumulated other comprehensive income (loss), net of tax:
 
Three Months Ended September 30, 2018
Six Months Ended September 30, 2018
 
Post-retirement plans
Derivatives designated as cash flow hedges
Totals
Post-retirement plans
Derivatives designated as cash flow hedges
Totals
Beginning of period
$
(20,548
)
$
7,769

$
(12,779
)
$
(20,955
)
$
5,849

$
(15,106
)
Other comprehensive income (loss) before reclassifications (1)

1,154

1,154


3,041

3,041

Amounts reclassified from accumulated other comprehensive loss
424

(116
)
308

831

(83
)
748

Net current-period other comprehensive income (loss)
424

1,038

1,462

831

2,958

3,789

End of period
$
(20,124
)
$
8,807

$
(11,317
)
$
(20,124
)
$
8,807

$
(11,317
)

(1) Changes in other comprehensive income (loss) before reclassification for derivatives designated as cash flow hedges are recorded net of tax expenses of $0.4 million and $1.1 million for the three and six months ended September 30, 2018, respectively.
 
Three Months Ended September 30, 2017
Six Months Ended September 30, 2017
 
Post-retirement plans
Derivatives designated as cash flow hedges
Totals
Post-retirement plans
Derivatives designated as cash flow hedges
Totals
Beginning of period
$
(16,714
)
$
(510
)
$
(17,224
)
$
(17,077
)
$

$
(17,077
)
Other comprehensive income (loss) before reclassifications (2)

(124
)
(124
)

(634
)
(634
)
Amounts reclassified from accumulated other comprehensive loss
361


361

724


724

Net current-period other comprehensive income (loss)
361

(124
)
237

724

(634
)
90

End of period
$
(16,353
)
$
(634
)
$
(16,987
)
$
(16,353
)
$
(634
)
$
(16,987
)

(2) Changes in other comprehensive income (loss) before reclassification for derivatives designated as cash flow hedges are recorded net of tax benefits of $0.1 million and $0.4 million for the three and six months ended September 30, 2017, respectively.
Reclassification out of accumulated other comprehensive loss to net income
The following table presents the reclassifications out of accumulated other comprehensive loss to net income:
 
Three Months Ended
September 30,
 
Six Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Amounts reclassified from accumulated other comprehensive loss:
 
 
 
 
 
 
 
Post-retirement plans (Note 12):
 
 
 
 
 
 
 
Amortization of net actuarial loss included in net periodic benefit cost
$
551

 
$
596

 
$
1,101

 
$
1,193

Tax benefit (expense)
(127
)
 
(235
)
 
(270
)
 
(469
)
Net of tax
$
424

 
$
361

 
$
831

 
$
724