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Employee Benefit Plans - Fair values of plan assets by asset category (Details 6) - USD ($) $ in Thousands | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | $ 57,110 | $ 54,293 | $ 44,032
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 6,094 | 9,357 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 35,057 | 24,424 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 15,959 | 20,513 | $ 8,989
Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 57,110 | 54,294 |
Cash and cash equivalents | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,023 | 713 |
Cash and cash equivalents | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Cash and cash equivalents | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Cash and cash equivalents | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,023 | 713 |
Common-collective funds - Global large cap equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Common-collective funds - Global large cap equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 12,385 | 11,963 |
Common-collective funds - Global large cap equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 7,132 | 6,596 |
Common-collective funds - Global large cap equities | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 19,517 | 18,559 |
Common-collective funds - Fixed income securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Common-collective funds - Fixed income securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 16,850 | 7,583 |
Common-collective funds - Fixed income securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 1,136 |  |
Common-collective funds - Fixed income securities | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 17,986 | 7,583 |
Common-collective funds - Global asset allocations/risk parity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Common-collective funds - Global asset allocations/risk parity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 5,822 | 4,878 |
Common-collective funds - Global asset allocations/risk parity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Common-collective funds - Global asset allocations/risk parity | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 5,822 | 4,878 |
Mutual funds - Global Equities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 1,972 | 4,611 |
Mutual funds - Global Equities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Mutual funds - Global Equities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Mutual funds - Global Equities | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 1,972 | 4,611 |
Mutual funds - Fixed income securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 1,099 | 1,366 |
Mutual funds - Fixed income securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Mutual funds - Fixed income securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Mutual funds - Fixed income securities | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 1,099 | 1,366 |
Mutual funds - Global asset allocations/risk parity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 2,667 |
Mutual funds - Global asset allocations/risk parity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Mutual funds - Global asset allocations/risk parity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Mutual funds - Global asset allocations/risk parity | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 2,667 |
Other - Fixed income securities | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Other - Fixed income securities | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Other - Fixed income securities | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 1,434 |
Other - Fixed income securities | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  | 1,434 |
Other - Global asset allocations/risk parity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Other - Global asset allocations/risk parity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Other - Global asset allocations/risk parity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 4,103 | 6,554 |
Other - Global asset allocations/risk parity | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 4,103 | 6,554 |
Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category |  |  |
Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | 3,588 | 5,929 |
Other | Total |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of plan assets by asset category | $ 3,588 | $ 5,929 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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