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Stock Based Compensation (Tables) | 12 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of 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, 2014 | 125 |  |  | $ | 22.29 |  |  |
Granted | — |  |  | — |  |  |
Forfeited | — |  |  | — |  |  |
Exercised | (25 | ) |  | 19.17 |  |  |
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 June 30, 2017 | 72 |  |  | $ | 50.04 |  |  | $ | 3,859 |
Vested and Expected to Vest June 30, 2017 | 72 |  |  | $ | 50.04 |  |  | $ | 3,859 |
Exercisable June 30, 2017 | 40 |  |  | $ | 20.55 |  |  | $ | 3,333 |
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, 2014 | 138 |  |  | 33.56 |
Granted | 12 |  |  | 57.77 |
Vested | (71 | ) |  | 35.69 |
Forfeited | (7 | ) |  | 46.39 |
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 June 30, 2017 | 36 |  |  | $ | 73.66 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] | The following table summarizes non-vested unit awards as of June 30, 2017, as well as activity for the year then ended:
Unit awards | Shares |  | Weighted Average Grant Date Fair Value |  | Aggregate Intrinsic Value
Outstanding July 1, 2014 | 709 |  |  | 31.66 |  |  |
Granted | 178 |  |  | 53.62 |  |  |
Vested | (277 | ) |  | 19.69 |  |  |
Forfeited | (111 | ) |  | 22.74 |  |  |
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 June 30, 2017 | 386 |  |  | $67.84 |  | $40,043
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,
| 2017 |  |  | 2016 |  |  | 2015 |
Volatility | 16.0 | % |  | 15.6 | % |  | 17.8 | %
Risk free interest rate | 0.93 | % |  | 1.06 | % |  | 1.06 | %
Dividend yield | 1.3 | % |  | 1.5 | % |  | 1.5 | %
Stock Beta | 0.684 |  |  | 0.741 |  |  | 0.765 |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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