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Benefit Plans (Tables) | 9 Months Ended
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Mar. 31, 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 March 31, |  | Nine Months Ended March 31,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 414 |  |  | $ | 720 |  |  | $ | 1,224 |  |  | $ | 2,180 |
Interest cost | 7,716 |  |  | 7,756 |  |  | 23,051 |  |  | 23,335 |
Expected return on plan assets | (14,188 | ) |  | (14,659 | ) |  | (42,410 | ) |  | (44,088 | )
Amortization of transition obligation | 24 |  |  | 22 |  |  | 70 |  |  | 67 |
Amortization of prior service (credit) cost | (42 | ) |  | (113 | ) |  | 90 |  |  | (339 | )
Recognition of actuarial losses | 1,746 |  |  | 2,066 |  |  | 5,174 |  |  | 6,266 |
Settlement gain | — |  |  | (320 | ) |  | — |  |  | (320 | )
Net periodic pension income | $ | (4,330 | ) |  | $ | (4,528 | ) |  | $ | (12,801 | ) |  | $ | (12,899 | )
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 March 31, |  | Nine Months Ended March 31,
(in thousands) | 2018 |  | 2017 |  | 2018 |  | 2017
Interest cost | $ | 157 |  |  | $ | 168 |  |  | $ | 471 |  |  | $ | 505 |
Amortization of prior service credit | (6 | ) |  | (6 | ) |  | (16 | ) |  | (16 | )
Recognition of actuarial loss | 70 |  |  | 89 |  |  | 210 |  |  | 266 |
Net periodic other postretirement benefit cost | $ | 221 |  |  | $ | 251 |  |  | $ | 665 |  |  | $ | 755 |

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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=82843861&loc=d3e1928-114920 + Details
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