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Employee Benefit Plans - Plan's target asset allocations and weighted average asset allocation of plan assets (Details 5)		Jun. 30, 2018	Jun. 30, 2017
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets		63.00%	33.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets		26.00%	38.00%
Global asset allocation/risk parity
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	[1]	10.00%	17.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets		1.00%	12.00%
Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018		55.00%
Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018		15.00%
Minimum | Global asset allocation/risk parity
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018	[1]	0.00%
Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018		0.00%
Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018		75.00%
Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018		35.00%
Maximum | Global asset allocation/risk parity
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018	[1]	20.00%
Maximum | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2018		10.00%
[1] The global asset allocation/risk parity category consists of a variety of asset classes including, but not limited to, global bonds, global equities, real estate and commodities.

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Percentage of investment to total investment within defined benefit plan asset category.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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-Publisher FASB
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