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Employee Benefit Plans (Tables) | 12 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Schedule of Changes in Projected Benefit Obligations and Plan Assets | The changes in the funded status of the Swiss Plan during the fiscal years ended June 30, 2019 and 2018 were as follows:
Year Ended June 30, |  | 2019 |  | 2018
Change in projected benefit obligation: |  |  |  |
Projected benefit obligation, beginning of period |  | $ | 62,554 |  |  | $ | 59,518 |
Service cost |  | 3,629 |  |  | 3,766 |
Interest cost |  | 528 |  |  | 424 |
Benefits accumulated, net of benefits paid |  | (103) |  |  | 1,474 |
Plan amendments |  | — |  |  | (4,068) |
Actuarial (gain) loss on obligation |  | 6,690 |  |  | 1,606 |
Participant contributions |  | 1,557 |  |  | 1,415 |
Currency translation adjustment |  | (1,372) |  |  | (1,581) |
Projected benefit obligation, end of period |  | $ | 73,483 |  |  | $ | 62,554 |
Change in plan assets: |  |  |  |
Plan assets at fair value, beginning of period |  | 49,034 |  |  | 42,990 |
Actual return on plan assets |  | 342 |  |  | 1,566 |
Employer contributions |  | 2,965 |  |  | 2,731 |
Participant contributions |  | 1,557 |  |  | 1,415 |
Benefits accumulated, net of benefits paid |  | (103) |  |  | 1,474 |
Currency translation adjustment |  | (1,076) |  |  | (1,142) |
Plan assets at fair value, end of period |  | $ | 52,719 |  |  | $ | 49,034 |
Amounts recognized in consolidated balance sheets: |  |  |  |
Other non-current assets: |  |  |  |
Deferred tax asset |  | $ | 4,392 |  |  | $ | 2,859 |
Other non-current liabilities: |  |  |  |
Underfunded pension liability |  | 20,764 |  |  | 13,520 |
Amounts recognized in accumulated other comprehensive income: |  |  |  |
Pension adjustment |  | $ | (11,784) |  |  | $ | 2,846 |
Accumulated benefit obligation, end of period |  | $ | 69,682 |  |  | $ | 59,800 |
Schedule of Net Periodic Pension Costs | Net periodic pension cost associated with the Swiss Plan included the following components:
Year Ended June 30, |  | 2019 |  | 2018 |  | 2017
Service cost |  | $ | 3,629 |  |  | $ | 3,766 |  |  | $ | 3,689 |
Interest cost |  | 528 |  |  | 424 |  |  | 163 |
Expected return on plan assets |  | 951 |  |  | 849 |  |  | (742) |
Net actuarial loss and prior service credit |  | 185 |  |  | 203 |  |  | 594 |
Net periodic pension cost |  | $ | 5,293 |  |  | $ | 5,242 |  |  | $ | 3,704 |
Schedule of Projected and Accumulated Benefit Obligations Rates | The projected and accumulated benefit obligations for the Swiss Plan were calculated as of June 30, 2019 and 2018 using the following assumptions:
June 30, |  | 2019 |  | 2018
Discount rate |  | 0.5 | % |  | 0.9 | %
Salary increase rate |  | 2.0 | % |  | 2.0 | %
Schedule of Assumptions Used in Calculation of Net Periodic Pension Cost | The net periodic pension cost for the Swiss Plan was calculated during the fiscal years ended June 30, 2019, 2018, and 2017 using the following assumptions:
Year Ended June 30, |  | 2019 |  | 2018 |  | 2017
Discount rate |  | 0.9 | % |  | 0.8 | % |  | 0.3 | %
Salary increase rate |  | 2.0 | % |  | 2.0 | % |  | 2.0 | %
Expected return on plan assets |  | 2.0 | % |  | 2.0 | % |  | 2.0 | %
Schedule of Swiss Plan's Asset Allocation | The Swiss Plan is legally separate from II-VI, as are the assets of the plan. As of June 30, 2019, the Swiss Plan’s asset allocation was as follows (all of which are categorized as Level 2 in the fair value hierarchy):
June 30, |  | 2019 |  | 2018
Fixed income investments |  | 12.0 | % |  | 12.0 | %
Equity investments |  | 50.0 | % |  | 50.0 | %
Real estate |  | 28.0 | % |  | 31.0 | %
Cash |  | 7.0 | % |  | 4.0 | %
Other |  | 3.0 | % |  | 3.0 | %
|  | 100.0 | % |  | 100.0 | %
Schedule of Estimated Future Benefit Payments Under Swiss Plan | Estimated future benefit payments under the Swiss Plan are estimated to be as follows:
Year Ending June 30, |
($000) |
2020 | $ | 3,400 |
2021 | 2,900 |
2022 | 3,000 |
2023 | 3,300 |
2024 | 5,100 |
Next five years | $ | 24,300 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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 (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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