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Employee Benefit Plans - Schedule of Single Employer Pension Plans (Details) - Pension Plan - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Components of net periodic benefit cost |  |  |  |
Service cost | $ 0 | $ 0 | $ 0 | $ 0
Interest cost | 859 | 1,059 | 2,578 | 3,177
Expected return on plan assets | (1,038) | (1,102) | (3,113) | (3,305)
Amortization of net loss (gain) | 502 | 370 | 1,507 | 1,109
Net periodic benefit cost | $ 323 | $ 327 | $ 972 | $ 981
Weighted average assumptions used to determine benefit obligations |  |  |  |
Discount rate |  |  | 2.55% | 3.45%
Expected long-term return on plan assets |  |  | 6.25% | 6.75%

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + 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 (k)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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