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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

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+ References

No definition available.

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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

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