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Benefit Plans (Tables) | 6 Months Ended
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Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract] |
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) | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Service cost | $ | 1,384 |  |  | $ | 1,732 |  |  | $ | 2,799 |  |  | $ | 3,448 |
Interest cost | 9,745 |  |  | 10,308 |  |  | 19,681 |  |  | 20,484 |
Expected return on plan assets | (14,900 | ) |  | (14,916 | ) |  | (29,947 | ) |  | (29,712 | )
Amortization of transition obligation | 19 |  |  | 20 |  |  | 40 |  |  | 38 |
Amortization of prior service credit | (71 | ) |  | (58 | ) |  | (141 | ) |  | (117 | )
Recognition of actuarial losses | 937 |  |  | 670 |  |  | 1,937 |  |  | 1,312 |
Curtailment loss | 358 |  |  | — |  |  | 358 |  |  | — |
Special termination benefit charge | 459 |  |  | — |  |  | 459 |  |  | — |
Net periodic pension income | $ | (2,069 | ) |  | $ | (2,244 | ) |  | $ | (4,814 | ) |  | $ | (4,547 | )
Net periodic other postretirement costs | The table below summarizes the components of the net periodic other postretirement benefit cost:
| Three Months Ended December 31, |  | Six Months Ended December 31,
(in thousands) | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Service cost | $ | 27 |  |  | $ | 14 |  |  | $ | 54 |  |  | $ | 28 |
Interest cost | 259 |  |  | 251 |  |  | 519 |  |  | 502 |
Amortization of prior service credit | (28 | ) |  | (28 | ) |  | (55 | ) |  | (56 | )
Recognition of actuarial loss | 207 |  |  | 79 |  |  | 414 |  |  | 158 |
Curtailment gain | (221 | ) |  | — |  |  | (221 | ) |  | — |
Net periodic other postretirement benefit cost | $ | 244 |  |  | $ | 316 |  |  | $ | 711 |  |  | $ | 632 |

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- Definition Net periodic other postretirement costs benefits. + 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=35743120&loc=d3e1928-114920 + Details
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