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Employee Benefit Plans - Fair values of plan assets by asset category (Details 6) - USD ($) $ in Thousands | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | $ 58,648 | $ 57,110 | $ 54,293
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 428 | 6,094 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 51,260 | 35,057 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 6,960 | 15,959 | $ 20,513
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 428 | 3,023 |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 428 | 3,023 |
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 | 15,443 | 19,517 |
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 | 11,632 | 12,385 |
Common-collective funds - Global large cap equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,811 | 7,132 |
Common-collective funds - Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 36,671 | 17,986 |
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 | 36,671 | 16,850 |
Common-collective funds - Fixed income securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 0 | 1,136 |
Common-collective funds - Global asset allocations/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 2,957 | 5,822 |
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 | 2,957 | 5,822 |
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 |
Mutual funds - Global Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 1,972 |
Mutual funds - Global Equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 1,972 |
Mutual funds - Global Equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Mutual funds - Global Equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Mutual funds - Fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 1,099 |
Mutual funds - Fixed income securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 1,099 |
Mutual funds - Fixed income securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Mutual funds - Fixed income securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Mutual funds - Global asset allocations/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Mutual funds - Global asset allocations/risk parity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Mutual funds - Global asset allocations/risk parity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Mutual funds - Global asset allocations/risk parity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 0 |
Other - Global asset allocations/risk parity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 2,881 | 4,103 |
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 | 2,881 | 4,103 |
Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 268 | 3,588 |
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 | $ 268 | $ 3,588 |

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