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Employee Benefit Plans - Fair values of plan assets by asset category (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | $ 79,099 | $ 75,791 | $ 64,593
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,592 | 1,812 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 71,631 | 68,247 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,876 | 5,732 | $ 5,649
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 386 | 1,812 |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 386 | 1,812 |
Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Common-collective funds - Global large cap equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 17,017 | 20,716 |
Common-collective funds - Global large cap equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Common-collective funds - Global large cap equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 13,201 | 16,678 |
Common-collective funds - Global large cap equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,816 | 4,038 |
Common-collective funds - Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 56,414 | 49,902 |
Common-collective funds - Fixed income securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Common-collective funds - Fixed income securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 56,414 | 49,902 |
Common-collective funds - Fixed income securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Common-collective funds - Global asset allocations/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 2,016 | 1,667 |
Common-collective funds - Global asset allocations/risk parity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Common-collective funds - Global asset allocations/risk parity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 2,016 | 1,667 |
Common-collective funds - Global asset allocations/risk parity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Other - Global asset allocations/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,206 | 1,669 |
Other - Global asset allocations/risk parity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,206 | 0 |
Other - Global asset allocations/risk parity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Other - Global asset allocations/risk parity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 1,669 |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 60 | 25 |
Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 0 |
Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | $ 60 | $ 25 |

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