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Benefit Plans (Tables)
 3 Months Ended
Sep. 30, 2017
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)
2017
 
2016
Service cost
$
404

 
$
733

Interest cost
7,657

 
7,809

Expected return on plan assets
(14,090
)
 
(14,757
)
Amortization of transition obligation
23

 
23

Amortization of prior service cost (credit)
173

 
(113
)
Recognition of actuarial losses
1,710

 
2,112

Net periodic pension (income) cost
$
(4,123
)
 
$
(4,193
)
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)
2017
 
2016
Interest cost
$
157

 
$
168

Amortization of prior service credit
(6
)
 
(6
)
Recognition of actuarial loss
70

 
89

Net periodic other postretirement benefit cost
$
221

 
$
251