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Employee Benefit Plans - Plan's target asset allocations and weighted average asset allocation of plan assets (Details)	Jun. 30, 2020	Jun. 30, 2019
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	66.00%	67.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	27.00%	28.00%
Common-collective funds - Global asset allocation/risk parity
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	5.00%	4.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	2.00%	1.00%
Minimum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	57.00%
Minimum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	18.00%
Minimum | Common-collective funds - Global asset allocation/risk parity
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	0.00%
Minimum | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	0.00%
Maximum | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	77.00%
Maximum | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	38.00%
Maximum | Common-collective funds - Global asset allocation/risk parity
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	15.00%
Maximum | Other
Defined Benefit Plan Disclosure [Line Items]
Target allocation for 2021	10.00%

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

+ References

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=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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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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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=118257860&loc=d3e4179-114921

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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