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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Sep. 30, 2018
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 September 30,
(in thousands)
2018
 
2017
Service cost
$
411

 
$
404

Interest cost
7,990

 
7,657

Expected return on plan assets
(13,462
)
 
(14,090
)
Amortization of transition obligation
23

 
23

Amortization of prior service (credit) cost
(5
)
 
173

Recognition of actuarial losses
1,695

 
1,710

Net periodic pension income
$
(3,348
)
 
$
(4,123
)
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 September 30,
(in thousands)
2018
 
2017
Interest cost
$
153

 
$
157

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

 
70

Net periodic other postretirement benefit cost
$
193

 
$
221