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Stock Based Compensation (Tables) | 12 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation, Stock Options, Activity [Table Text Block] | A summary of option plan activity under the plans is as follows:
| Number of Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Outstanding July 1, 2015 | 100 |  |  | $ | 23.07 |  |  |
Granted | — |  |  | — |  |  |
Forfeited | — |  |  | — |  |  |
Exercised | (50 | ) |  | 23.99 |  |  |
Outstanding July 1, 2016 | 50 |  |  | 22.14 |  |  |
Granted | 32 |  |  | 87.27 |  |  |
Forfeited | — |  |  | — |  |  |
Exercised | (10 | ) |  | 28.52 |  |  |
Outstanding July 1, 2017 | 72 |  |  | 50.04 |  |  |
Granted | — |  |  | — |  |  |
Forfeited | — |  |  | — |  |  |
Exercised | (20 | ) |  | 17.45 |  |  |
Outstanding June 30, 2018 | 52 |  |  | $ | 62.65 |  |  | $ | 3,500 |
Vested and Expected to Vest June 30, 2018 | 52 |  |  | $ | 62.65 |  |  | $ | 3,500 |
Exercisable June 30, 2018 | 20 |  |  | $ | 23.65 |  |  | $ | 2,134 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The assumptions used in estimating fair value and resulting compensation expenses at the grant dates are as follows:
Expected Life (years) | 6.50 |
Volatility | 19.60 | %
Risk-free interest rate | 1.24 | %
Dividend yield | 1.28 | %
Schedule of Nonvested Restricted Stock Activity [Table Text Block] | The following table summarizes non-vested share awards activity:
Share awards | Shares |  | Weighted Average Grant Date Fair Value
Outstanding July 1, 2015 | 72 |  |  | $ | 34.28 |
Granted | 22 |  |  | 66.31 |
Vested | (24 | ) |  | 43.45 |
Forfeited | (12 | ) |  | 23.82 |
Outstanding July 1, 2016 | 58 |  |  | 44.95 |
Granted | 17 |  |  | 87.27 |
Vested | (38 | ) |  | 37.00 |
Forfeited | (1 | ) |  | 65.52 |
Outstanding July 1, 2017 | 36 |  |  | 73.66 |
Granted | — |  |  | — |
Vested | (12 | ) |  | 58.61 |
Forfeited | (1 | ) |  | 64.60 |
Outstanding June 30, 2018 | 23 |  |  | $ | 81.33 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes non-vested unit awards as of June 30, 2018, as well as activity for the fiscal year then ended:
Unit awards | Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
Outstanding July 1, 2015 | 499 |  |  | $ | 48.13 |  |  |
Granted | 130 |  |  | 75.99 |  |  |
Vested | (99 | ) |  | 44.09 |  |  |
Forfeited | (101 | ) |  | 45.89 |  |  |
Outstanding July 1, 2016 | 429 |  |  | 58.06 |  |  |
Granted | 130 |  |  | 77.75 |  |  |
Vested | (136 | ) |  | 50.12 |  |  |
Forfeited | (37 | ) |  | 54.30 |  |  |
Outstanding July 1, 2017 | 386 |  |  | 67.84 |  |  |
Granted | 125 |  |  | 98.41 |  |  |
Vested | (156 | ) |  | 57.00 |  |  |
Forfeited | (4 | ) |  | 81.83 |  |  |
Outstanding June 30, 2018 | 351 |  |  | $83.37 |  | $45,806
ScheduleOfShareBasedPaymentAwardRSUValuationAssumptionsTableTextBlock [Table Text Block] | The weighted average assumptions used in this model to estimate fair value at the grant dates are as follows:
| Year Ended June 30,
| 2018 |  |  | 2017 |  |  | 2016 |
Volatility | 15.6 | % |  | 16.0 | % |  | 15.6 | %
Risk free interest rate | 1.55 | % |  | 0.93 | % |  | 1.06 | %
Dividend yield | 1.2 | % |  | 1.3 | % |  | 1.5 | %
Stock Beta | 0.687 |  |  | 0.684 |  |  | 0.741 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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