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Benefit Plans (Tables) | 6 Months Ended
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Dec. 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 December 31, |  | Six Months Ended December 31,
(in thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 727 |  |  | $ | 1,156 |  |  | $ | 1,460 |  |  | $ | 2,319 |
Interest cost | 7,770 |  |  | 9,438 |  |  | 15,579 |  |  | 18,923 |
Expected return on plan assets | (14,672 | ) |  | (14,657 | ) |  | (29,429 | ) |  | (29,364 | )
Amortization of transition obligation | 22 |  |  | 21 |  |  | 45 |  |  | 42 |
Amortization of prior service credit | (113 | ) |  | (104 | ) |  | (226 | ) |  | (209 | )
Recognition of actuarial losses | 2,088 |  |  | 1,815 |  |  | 4,200 |  |  | 3,648 |
Special termination benefit charge | — |  |  | 54 |  |  | — |  |  | 107 |
Net periodic pension income | $ | (4,178 | ) |  | $ | (2,277 | ) |  | $ | (8,371 | ) |  | $ | (4,534 | )
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 December 31, |  | Six Months Ended December 31,
(in thousands) | 2016 |  | 2015 |  | 2016 |  | 2015
Interest cost | $ | 168 |  |  | $ | 210 |  |  | $ | 337 |  |  | $ | 420 |
Amortization of prior service credit | (6 | ) |  | (5 | ) |  | (11 | ) |  | (11 | )
Recognition of actuarial loss | 89 |  |  | 81 |  |  | 177 |  |  | 162 |
Net periodic other postretirement benefit cost | $ | 251 |  |  | $ | 286 |  |  | $ | 503 |  |  | $ | 571 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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