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Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Defined benefit plan, target plan asset allocations | 100.00% | 100.00% |
Defined benefit plan, estimated future employer contributions in next fiscal year | $ 3,100,000 |  |
Defined benefit plan maximum yearly expected future benefit | 5,300,000.0 |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 33,555,000 | $ 27,932,000 | $ 21,780,000
Recurring |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 33,555,000 | 27,932,000 |
Recurring | Level 1 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 18,571,000 | 15,737,000 |
Recurring | Level 2 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 14,984,000 | 12,195,000 |
Recurring | Cash and cash equivalents |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 18,571,000 | 15,737,000 |
Recurring | Cash and cash equivalents | Level 1 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 18,571,000 | 15,737,000 |
Recurring | Cash and cash equivalents | Level 2 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 0 | 0 |
Recurring | Bonds, equity securities and other investments |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 14,984,000 | 12,195,000 |
Recurring | Bonds, equity securities and other investments | Level 1 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | 0 | 0 |
Recurring | Bonds, equity securities and other investments | Level 2 |  |  |
Fair Value Measurements |  |  |
Total assets measured at fair value | $ 14,984,000 | $ 12,195,000 |

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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