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Employee Benefit Plans (Tables) | 12 Months Ended
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Jun. 30, 2021
Employee Benefit Plans |
Schedule of changes in projected benefit obligation, plan assets and the funded status | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2021 |  | 2020
Change in projected benefit obligation | ​ | ​ | ​ | ​ | ​ | ​
Projected benefit obligation at beginning of year | ​ | $ | 79,353 |  | $ | 68,527
Interest cost | ​ |  | 1,682 |  | ​ | 2,112
Benefits paid | ​ |  | (2,260) |  | ​ | (2,000)
Actuarial (gain) / loss | ​ |  | (860) |  | ​ | 10,714
Projected benefit obligation at end of year | ​ | $ | 77,915 |  | $ | 79,353
​
​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2021 |  | 2020
Change in plan assets | ​ | ​ |  | ​ | ​ |
Fair value of plan assets at beginning of year | ​ | $ | 75,791 | ​ | $ | 64,593
Actual return on plan assets | ​ |  | 4,838 | ​ |  | 10,821
Employer contributions | ​ |  | 730 | ​ |  | 2,377
Benefits paid | ​ |  | (2,260) | ​ |  | (2,000)
Fair value of plan assets at end of year | ​ | $ | 79,099 | ​ | $ | 75,791
Asset (Liability) Funded status at end of year | ​ | $ | 1,184 | ​ | $ | (3,562)
Schedule of accumulated other comprehensive (income) loss related to the pension plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2021 |  | 2020
Accumulated other comprehensive income (loss) related to pension plan |  | ​ |  | ​ |  |
Balance at beginning of period | ​ | $ | (22,571) | ​ | $ | (20,050)
Amortization of net actuarial loss and prior service costs | ​ |  | 560 | ​ |  | 515
Current period net actuarial gain (loss) | ​ |  | 2,038 | ​ |  | (3,036)
Net change | ​ |  | 2,598 | ​ |  | (2,521)
Balance at end of period | ​ | $ | (19,973) | ​ | $ | (22,571)
Schedule of net periodic pension expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2021 |  | 2020 |  | 2019
Interest cost on benefit obligation | ​ | $ | 1,682 | ​ | $ | 2,112 | ​ | $ | 2,407
Expected return on plan assets | ​ |  | (3,660) | ​ |  | (3,144) | ​ |  | (2,842)
Amortization of net actuarial loss and prior service costs | ​ |  | 560 | ​ |  | 515 | ​ |  | 465
Net periodic pension (income) expense | ​ | $ | (1,418) | ​ | $ | (517) | ​ | $ | 30
Schedule of significant actuarial assumptions | ​
​ ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the Year Ended June 30 |  | 2021 |  | 2020 |  | 2019 |
Discount rate for interest cost |  | 2.2 | % | 2.2 | % | 3.1 | %
Expected rate of return on plan assets |  | 4.4 | % | 4.9 | % | 4.9 | %
Discount rate for year-end benefit obligation |  | 2.9 | % | 2.8 | % | 3.6 | %
Schedule of estimated future benefit payments, including benefits attributable to future service | ​
​ | ​ | ​ | ​
For the Year Ended June 30 |  | ​ | ​
2022 | ​ | $ | 3,146
2023 | ​ |  | 3,392
2024 | ​ |  | 3,575
2025 | ​ | ​ | 3,712
2026 | ​ | ​ | 3,830
2027 – 2031 | ​ |  | 20,414
Schedule of weighted-average asset allocation of plan assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Target | ​ | ​ | ​ | ​
​ | ​ | Allocation | ​ | Percentage of Plan Assets
For the Year Ended June 30 |  | 2022 |  | 2021 |  | 2020
Debt securities |  | 65% - 85% | ​ | 71% | ​ | 66%
Equity securities |  | 10% - 30% | ​ | 21% | ​ | 27%
Global asset allocation/risk parity(1) |  | 0% - 15% | ​ | 7% | ​ | 5%
Other |  | 0% - 10% | ​ | 1% | ​ | 2%
(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, 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements Using
As of June 30, 2020 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash and cash equivalents | ​ | $ | 1,812 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,812
Common-collective funds | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Global large cap equities | ​ |  | — | ​ |  | 16,678 | ​ | ​ | 4,038 | ​ |  | 20,716
Fixed income securities | ​ |  | — | ​ |  | 49,902 | ​ |  | — | ​ |  | 49,902
Global asset allocations/risk parity | ​ |  | — | ​ |  | 1,667 | ​ |  | — | ​ |  | 1,667
Other | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Global asset allocations/risk parity | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,669 | ​ | ​ | 1,669
Other | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 25 | ​ | ​ | 25
​ | ​ | $ | 1,812 | ​ | $ | 68,247 | ​ | $ | 5,732 | ​ | $ | 75,791
Schedule of summary of the changes in the fair value of level 3 assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
Change in Fair Value Level 3 assets |  | 2021 |  | 2020
Balance at beginning of period | ​ | $ | 5,732 | ​ | $ | 5,649
Redemptions | ​ |  | (3,236) | ​ |  | (49)
Purchases | ​ |  | 300 | ​ |  | 200
Change in fair value | ​ |  | 1,080 | ​ |  | (68)
Balance at end of period | ​ | $ | 3,876 | ​ | $ | 5,732

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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 net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&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 http://asc.fasb.org/extlink&oid=118255775&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 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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