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Employee Benefit Plans (Tables) | 12 Months Ended
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Jun. 30, 2022
Employee Benefit Plans |
Schedule of changes in projected benefit obligation, plan assets and the funded status | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2022 |  | 2021
Change in projected benefit obligation | ​ | ​ | ​ | ​ | ​ | ​
Projected benefit obligation at beginning of year | ​ | $ | 77,915 |  | $ | 79,353
Interest cost | ​ |  | 1,675 |  | ​ | 1,682
Benefits paid | ​ |  | (2,426) |  | ​ | (2,260)
Actuarial gain | ​ |  | (14,085) |  | ​ | (860)
Projected benefit obligation at end of year | ​ | $ | 63,079 |  | $ | 77,915
​
​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2022 |  | 2021
Change in plan assets | ​ | ​ |  | ​ | ​ |
Fair value of plan assets at beginning of year | ​ | $ | 79,099 | ​ | $ | 75,791
Actual return on plan assets | ​ |  | (15,387) | ​ |  | 4,838
Employer contributions | ​ |  | — | ​ |  | 730
Benefits paid | ​ |  | (2,426) | ​ |  | (2,260)
Fair value of plan assets at end of year | ​ | $ | 61,286 | ​ | $ | 79,099
Asset (Liability) funded status at end of year | ​ | $ | (1,793) | ​ | $ | 1,184
​
Schedule of accumulated other comprehensive (income) loss related to the pension plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2022 |  | 2021
Accumulated other comprehensive income (loss) related to pension plan |  | ​ |  | ​ |  |
Balance at beginning of period | ​ | $ | (19,973) | ​ | $ | (22,571)
Amortization of net actuarial loss and prior service costs | ​ |  | 480 | ​ |  | 560
Current period net actuarial gain (loss) | ​ |  | (4,715) | ​ |  | 2,038
Net change | ​ |  | (4,235) | ​ |  | 2,598
Balance at end of period | ​ | $ | (24,208) | ​ | $ | (19,973)
​
Schedule of net periodic pension expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2022 |  | 2021 |  | 2020
Interest cost on benefit obligation | ​ | $ | 1,675 | ​ | $ | 1,682 | ​ | $ | 2,112
Expected return on plan assets | ​ |  | (3,413) | ​ |  | (3,660) | ​ |  | (3,144)
Amortization of net actuarial loss and prior service costs | ​ |  | 480 | ​ |  | 560 | ​ |  | 515
Net periodic pension income | ​ | $ | (1,258) | ​ | $ | (1,418) | ​ | $ | (517)
​
Schedule of significant actuarial assumptions | ​
​ ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2022 |  | 2021 |  | 2020 |
Discount rate for interest cost |  | 2.2 | % | 2.2 | % | 2.2 | %
Expected rate of return on plan assets |  | 4.4 | % | 4.4 | % | 4.9 | %
Discount rate for year-end benefit obligation |  | 4.6 | % | 2.9 | % | 2.8 | %
​
Schedule of estimated future benefit payments, including benefits attributable to future service | ​
​ | ​ | ​ | ​
For the Year Ended June 30 |  | ​ | ​
2023 | ​ | $ | 3,398
2024 | ​ |  | 3,606
2025 | ​ | ​ | 3,758
2026 | ​ | ​ | 3,883
2027 | ​ | ​ | 4,022
2028 – 2032 | ​ |  | 21,002
​
Schedule of weighted-average asset allocation of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Target | ​ | ​ | ​ | ​
​ | ​ | Allocation | ​ | Percentage of Plan Assets
For the Year Ended June 30 |  | 2023 |  | 2022 |  | 2021
Debt securities |  | 65% - 85% | ​ | 77% |  | 71%
Equity securities |  | 10% - 30% | ​ | 17% | ​ | 21%
Global asset allocation/risk parity(1) |  | 0% - 15% | ​ | 5% | ​ | 7%
Other |  | 0% - 10% | ​ | 1% | ​ | 1%
(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.
​
Schedule of fair values of the company's plan assets by asset category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements Using
As of June 30, 2022 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents | ​ | $ | 362 | ​ | $ | — | ​ | $ | — | ​ | $ | 362
Common-collective funds |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Global large cap equities |  | ​ | — |  | ​ | 8,783 |  | ​ | 1,952 |  | ​ | 10,735
Fixed income securities |  | ​ | 665 |  | ​ | 46,491 |  | ​ | — |  | ​ | 47,156
Mutual funds |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Global asset allocations/risk parity |  | ​ | 3,023 |  | ​ | — |  | ​ | — |  | ​ | 3,023
Other | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other |  | ​ | — |  | ​ | — |  | ​ | 10 |  | ​ | 10
​ | ​ | $ | 4,050 | ​ | $ | 55,274 | ​ | $ | 1,962 | ​ | $ | 61,286
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements Using
As of June 30, 2021 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents | ​ | $ | 386 | ​ | $ | — | ​ | $ | — | ​ | $ | 386
Common-collective funds |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Global large cap equities |  | ​ | — |  | ​ | 13,201 |  | ​ | 3,816 |  | ​ | 17,017
Fixed income securities |  | ​ | — |  | ​ | 56,414 |  | ​ | — |  | ​ | 56,414
Global asset allocations/risk parity |  | ​ | — |  | ​ | 2,016 |  | ​ | — |  | ​ | 2,016
Mutual funds |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
Global asset allocations/risk parity |  | ​ | 3,206 |  | ​ | — |  | ​ | — |  | ​ | 3,206
Other | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other |  | ​ | — |  | ​ | — |  | ​ | 60 |  | ​ | 60
​ | ​ | $ | 3,592 | ​ | $ | 71,631 | ​ | $ | 3,876 | ​ | $ | 79,099
​
Schedule of summary of the changes in the fair value of level 3 assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in Fair Value Level 3 assets |  | 2022 |  | 2021
Balance at beginning of period | ​ | $ | 3,876 | ​ | $ | 5,732
Redemptions | ​ |  | (1,199) | ​ |  | (3,236)
Purchases | ​ |  | — | ​ |  | 300
Change in fair value | ​ |  | (715) | ​ |  | 1,080
Balance at end of period | ​ | $ | 1,962 | ​ | $ | 3,876
​

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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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + 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 (k) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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 (b) -URI https://asc.fasb.org/extlink&oid=123447040&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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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