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Benefit Plans (Tables)
 6 Months Ended
Dec. 31, 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 December 31,
 
Six Months Ended December 31,
(in thousands)
2017
 
2016
 
2017
 
2016
Service cost
$
406

 
$
727

 
$
810

 
$
1,460

Interest cost
7,678

 
7,770

 
15,335

 
15,579

Expected return on plan assets
(14,132
)
 
(14,672
)
 
(28,221
)
 
(29,429
)
Amortization of transition obligation
23

 
22

 
46

 
45

Amortization of prior service (credit) cost
(41
)
 
(113
)
 
132

 
(226
)
Recognition of actuarial losses
1,718

 
2,088

 
3,428

 
4,200

Net periodic pension income
$
(4,348
)
 
$
(4,178
)
 
$
(8,470
)
 
$
(8,371
)
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 December 31,
 
Six Months Ended December 31,
(in thousands)
2017
 
2016
 
2017
 
2016
Interest cost
$
157

 
$
168

 
$
314

 
$
337

Amortization of prior service credit
(6
)
 
(6
)
 
(11
)
 
(11
)
Recognition of actuarial loss
70

 
89

 
140

 
177

Net periodic other postretirement benefit cost
$
221

 
$
251

 
$
443

 
$
503