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Employee Benefit Plans (Tables) | 12 Months Ended
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Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of changes in projected benefit obligation, plan assets and the funded status |
For the Years Ended June 30 | ​ | ​ | 2015 | ​ | ​ | 2014 | ​
Change in projected benefit obligation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Projected benefit obligation at beginning of year | ​ | ​ | ​ | $ | 57,599 | ​ | ​ | ​ | ​ | $ | 46,569 | ​ | ​
Service cost | ​ | ​ | ​ | ​ | 2,954 | ​ | ​ | ​ | ​ | ​ | 2,457 | ​ | ​
Interest cost | ​ | ​ | ​ | ​ | 2,618 | ​ | ​ | ​ | ​ | ​ | 2,333 | ​ | ​
Benefits paid | ​ | ​ | ​ | ​ | (1,116) | ​ | ​ | ​ | ​ | ​ | (1,092) | ​ | ​
Actuarial (gain) loss | ​ | ​ | ​ | ​ | 550 | ​ | ​ | ​ | ​ | ​ | 7,332 | ​ | ​
Projected benefit obligation at end of year | ​ | ​ | ​ | $ | 62,605 | ​ | ​ | ​ | ​ | $ | 57,599 | ​ | ​
Change in plan assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of plan assets at beginning of year | ​ | ​ | ​ | $ | 39,581 | ​ | ​ | ​ | ​ | $ | 31,501 | ​ | ​
Actual return on plan assets | ​ | ​ | ​ | ​ | (1,248) | ​ | ​ | ​ | ​ | ​ | 4,339 | ​ | ​
Employer contributions | ​ | ​ | ​ | ​ | 6,815 | ​ | ​ | ​ | ​ | ​ | 4,833 | ​ | ​
Benefits paid | ​ | ​ | ​ | ​ | (1,116) | ​ | ​ | ​ | ​ | ​ | (1,092) | ​ | ​
Fair value of plan assets at end of year | ​ | ​ | ​ | $ | 44,032 | ​ | ​ | ​ | ​ | $ | 39,581 | ​ | ​
Funded status at end of year | ​ | ​ | ​ | $ ​ | (18,573) | ​ | ​ | ​ | ​ | $ | (18,018) | ​ | ​
​
Schedule of accumulated other comprehensive (income) loss related to the pension plan |
For the Years Ended June 30 | ​ | ​ | 2015 | ​ | ​ | 2014 | ​
Balance at beginning of period | ​ | ​ | ​ | $ | 16,663 | ​ | ​ | ​ | ​ | $ | 12,240 | ​ | ​
Amortization of net actuarial loss (gain) and prior service costs | ​ | ​ | ​ | ​ | (1,405) | ​ | ​ | ​ | ​ | ​ | (903) | ​ | ​
Current period net actuarial loss (gain) | ​ | ​ | ​ | ​ | 4,626 | ​ | ​ | ​ | ​ | ​ | 5,326 | ​ | ​
Net change | ​ | ​ | ​ | ​ | 3,221 | ​ | ​ | ​ | ​ | ​ | 4,423 | ​ | ​
Balance at end of period | ​ | ​ | ​ | $ | 19,884 | ​ | ​ | ​ | ​ | $ | 16,663 | ​ | ​
​
Schedule of net periodic pension expense |
For the Years Ended June 30 | ​ | ​ | 2015 | ​ | ​ | 2014 | ​ | ​ | 2013 | ​
Service cost−benefits earned during the year | ​ | ​ | ​ | $ | 2,954 | ​ | ​ | ​ | ​ | $ | 2,457 | ​ | ​ | ​ | ​ | $​ | 2,729 | ​ | ​
Interest cost on benefit obligation | ​ | ​ | ​ | ​ | 2,618 | ​ | ​ | ​ | ​ | ​ | 2,333 | ​ | ​ | ​ | ​ | ​ | 2,058 | ​ | ​
Expected return on plan assets | ​ | ​ | ​ | ​ | (2,828) | ​ | ​ | ​ | ​ | ​ | (2,334) | ​ | ​ | ​ | ​ | ​ | (2,136) | ​ | ​
Amortization of net actuarial loss and prior service costs | ​ | ​ | ​ | ​ | 1,405 | ​ | ​ | ​ | ​ | ​ | 904 | ​ | ​ | ​ | ​ | ​ | 1,405 | ​ | ​
Net periodic pension expense | ​ | ​ | ​ | $ | 4,149 | ​ | ​ | ​ | ​ | $ | 3,360 | ​ | ​ | ​ | ​ | $ | 4,056 | ​ | ​
​
Schedule of significant actuarial assumptions |
For the Years Ended June 30 | ​ | ​ | 2015 | ​ | ​ | 2014 | ​ | ​ | 2013 | ​
Discount rate for service and interest | ​ | ​ | 4.5%​ | ​ | ​ | 5.0%​ | ​ | ​ | 4.4%​ | ​
Expected rate of return on plan assets | ​ | ​ | 6.7%​ | ​ | ​ | 7.0%​ | ​ | ​ | 7.5%​ | ​
Rate of compensation increase | ​ | ​ | 3.0%–3.75%​ | ​ | ​ | 3.0%–4.5%​ | ​ | ​ | 3.0%–4.5%​ | ​
Discount rate for year-end benefit obligation | ​ | ​ | 4.6%​ | ​ | ​ | 4.5%​ | ​ | ​ | 5.0%​ | ​
Schedule of estimated future benefit payments, including benefits attributable to future service |
For the Years Ended June 30 | ​ | ​ | ​ | ​ | ​ | ​ | ​
2016 | ​ | ​ | ​ | $ | 1,685 | ​ | ​
2017 | ​ | ​ | ​ | ​ | 1,938 | ​ | ​
2018 | ​ | ​ | ​ | ​ | 2,173 | ​ | ​
2019 | ​ | ​ | ​ | ​ | 2,433 | ​ | ​
2020 | ​ | ​ | ​ | ​ | 2,724 | ​ | ​
2021–2024 | ​ | ​ | ​ | ​ | 17,886 | ​ | ​
Schedule of weighted-average asset allocation of plan assets |
​ | ​ | ​ | Target Allocation | ​ | ​ | Percentage of Plan Assets | ​
For the years ended June 30 | ​ | ​ | 2016 | ​ | ​ | 2015 | ​ | ​ | 2014 | ​
Debt securities | ​ | ​ | 10%–35%​ | ​ | ​ | ​ | ​ | 19% | ​ | ​ | ​ | ​ | ​ | 20% | ​ | ​
Equity securities | ​ | ​ | 20%–50%​ | ​ | ​ | ​ | ​ | 35% | ​ | ​ | ​ | ​ | ​ | 35% | ​ | ​
Global asset allocation/risk parity(1) | ​ | ​ | 20%–40%​ | ​ | ​ | ​ | ​ | 35% | ​ | ​ | ​ | ​ | ​ | 35% | ​ | ​
Other | ​ | ​ | 0%–25%​ | ​ | ​ | ​ | ​ | 11% | ​ | ​ | ​ | ​ | ​ | 10% | ​ | ​
​ (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, 2015 | ​ | ​ | Level 1 | ​ | ​ | Level 2 | ​ | ​ | Level 3 | ​ | ​ | Total | ​
Cash and cash equivalents | ​ | ​ | ​ | $ | 129 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 129 | ​ | ​
Common-collective funds | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Global large cap equities | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 10,995 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 10,995 | ​ | ​
Fixed income securities | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 8,565 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 8,565 | ​ | ​
Global asset allocations/risk parity | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 6,685 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 6,685 | ​ | ​
Mutual funds | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Global equities | ​ | ​ | ​ | ​ | 4,366 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,366 | ​ | ​
Global asset allocations/risk parity | ​ | ​ | ​ | ​ | 4,303 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,303 | ​ | ​
Other | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Global asset allocations/risk parity | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,251 | ​ | ​ | ​ | ​ | ​ | 4,251 | ​ | ​
Other | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,738 | ​ | ​ | ​ | ​ | ​ | 4,738 | ​ | ​
​ | ​ | ​ | ​ | $ | 8,798 | ​ | ​ | ​ | ​ | $ | 26,245 | ​ | ​ | ​ | ​ | $ | 8,989 | ​ | ​ | ​ | ​ | $ | 44,032 | ​ | ​
​
​ | ​ | ​ | Fair Value Measurements Using | ​
As of June 30, 2014 | ​ | ​ | Level 1 | ​ | ​ | Level 2 | ​ | ​ | Level 3 | ​ | ​ | Total | ​
Cash and cash equivalents | ​ | ​ | ​ | $ | 138 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 138 | ​ | ​
Common-collective funds | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Global large cap equities | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 9,909 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 9,909 | ​ | ​
Fixed income securities | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 3,935 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 3,935 | ​ | ​
Global asset allocations/risk parity | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 5,803 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 5,803 | ​ | ​
Mutual funds | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Global equities | ​ | ​ | ​ | ​ | 3,925 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 3,925 | ​ | ​
Fixed income securities | ​ | ​ | ​ | ​ | 1,913 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,913 | ​ | ​
Global asset allocations/risk parity | ​ | ​ | ​ | ​ | 3,927 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 3,927 | ​ | ​
Other | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fixed income securities | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,007 | ​ | ​ | ​ | ​ | ​ | 2,007 | ​ | ​
Global asset allocations/risk parity | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 3,954 | ​ | ​ | ​ | ​ | ​ | 3,954 | ​ | ​
Other | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,070 | ​ | ​ | ​ | ​ | ​ | 4,070 | ​ | ​
​ | ​ | ​ | ​ | $ | 9,903 | ​ | ​ | ​ | ​ | $ | 19,647 | ​ | ​ | ​ | ​ | $ | 10,031 | ​ | ​ | ​ | ​ | $ | 39,581 | ​ | ​
​
Schedule of summary of the changes in the fair value of level 3 assets |
Change in Fair Value Level 3 assets | ​ | ​ | 2015 | ​ | ​ | 2014 | ​
Balance at beginning of period | ​ | ​ | ​ | $ | 10,031 | ​ | ​ | ​ | ​ | $ | 280 | ​ | ​
Redemptions | ​ | ​ | ​ | ​ | (2,026) | ​ | ​ | ​ | ​ | ​ | 22 | ​ | ​
Purchases | ​ | ​ | ​ | ​ | 1,280 | ​ | ​ | ​ | ​ | ​ | 9,773 | ​ | ​
Change in fair value | ​ | ​ | ​ | ​ | (296) | ​ | ​ | ​ | ​ | ​ | (44) | ​ | ​
Balance at end of period | ​ | ​ | ​ | $ | 8,989 | ​ | ​ | ​ | ​ | $ | 10,031 | ​ | ​
​

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=58740216&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(4) -URI http://asc.fasb.org/extlink&oid=58740216&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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