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Stock Based Compensation (Tables)
 12 Months Ended
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