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Benefit Plans (Tables)
 9 Months Ended
Mar. 31, 2016
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)
2016
 
2015
 
2016
 
2015
Service cost
$
1,154

 
$
1,349

 
$
3,473

 
$
4,148

Interest cost
9,375

 
9,575

 
28,299

 
29,256

Expected return on plan assets
(14,560
)
 
(14,797
)
 
(43,924
)
 
(44,744
)
Amortization of transition obligation
19

 
18

 
61

 
58

Amortization of prior service credit
(104
)
 
(72
)
 
(313
)
 
(213
)
Recognition of actuarial losses
1,805

 
871

 
5,452

 
2,809

Curtailment loss
—

 
—

 
—

 
358

Special termination benefit charge
—

 
—

 
214

 
459

Net periodic pension (income)
$
(2,311
)
 
$
(3,056
)
 
$
(6,738
)
 
$
(7,869
)
Other Postretirement Benefit 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)
2016
 
2015
 
2016
 
2015
Service cost
$
—

 
$
27

 
$
—

 
$
81

Interest cost
210

 
259

 
630

 
778

Amortization of prior service credit
(6
)
 
(28
)
 
(16
)
 
(83
)
Recognition of actuarial loss
81

 
207

 
242

 
621

Curtailment gain
—

 
—

 
—

 
(221
)
Net periodic other postretirement benefit cost
$
285

 
$
465

 
$
856

 
$
1,176