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Retirement Benefit Plans (Tables) | 9 Months Ended
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Mar. 31, 2020
Retirement Benefit Plans |
Schedule of net periodic pension expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​ | Nine Months Ended March 31,
​ |  | 2019 |  | 2020 |  | 2019 |  | 2020
Service cost | ​ | $ | 98 | ​ | $ | 100 | ​ | $ | 295 | ​ | $ | 300
Interest cost | ​ | ​ | 8 | ​ | ​ | 8 | ​ | ​ | 25 | ​ | ​ | 24
Amortization of prior service cost | ​ | ​ | 14 | ​ | ​ | 13 | ​ |  | 42 | ​ |  | 39
Net periodic pension expense | ​ | $ | 120 | ​ | $ | 121 | ​ | $ | 362 | ​ | $ | 363
​

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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