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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Mar. 31, 2019
Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net periodic pension (income)
The table below summarizes the components of net periodic pension income:
 
Three Months Ended March 31,
 
Nine Months Ended March 31,
(in thousands)
2019
 
2018
 
2019
 
2018
Service cost
$
406

 
$
414

 
$
1,224

 
$
1,224

Interest cost
7,979

 
7,716

 
23,939

 
23,051

Expected return on plan assets
(13,456
)
 
(14,188
)
 
(40,352
)
 
(42,410
)
Amortization of transition obligation
23

 
24

 
68

 
70

Amortization of prior service (credit) cost
(5
)
 
(42
)
 
(15
)
 
90

Recognition of actuarial losses
1,682

 
1,746

 
5,056

 
5,174

Net periodic pension income
$
(3,371
)
 
$
(4,330
)
 
$
(10,080
)
 
$
(12,801
)
Other Postretirement Benefits Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Net periodic pension (income)
The table below summarizes the components of net periodic other postretirement benefit cost:
 
Three Months Ended March 31,
 
Nine Months Ended March 31,
(in thousands)
2019
 
2018
 
2019
 
2018
Interest cost
$
153

 
$
157

 
$
460

 
$
471

Amortization of prior service credit
(22
)
 
(6
)
 
(68
)
 
(16
)
Recognition of actuarial loss
62

 
70

 
186

 
210

Net periodic other postretirement benefit cost
$
193

 
$
221

 
$
578

 
$
665