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Employee Benefit Plans - Fair values of plan assets by asset category (Details 6) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | $ 64,593 | $ 58,648 | $ 57,110
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 215 | 428 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 58,729 | 51,260 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 5,649 | 6,960 | $ 15,959
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 215 | 428 |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 215 | 428 |
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 | 18,011 | 15,443 |
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 | 13,995 | 11,632 |
Common-collective funds - Global large cap equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 4,016 | 3,811 |
Common-collective funds - Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 43,288 | 36,671 |
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 | 43,288 | 36,671 |
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 | 1,446 | 2,957 |
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 | 1,446 | 2,957 |
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 | 1,447 | 2,881 |
Other - Global asset allocations/risk parity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 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 | 1,447 | 2,881 |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 186 | 268 |
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 | $ 186 | $ 268 |

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