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Stock Based Compensation (Tables)
 12 Months Ended
Jun. 30, 2019
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, 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 July 1, 2018
52

 
62.65

 
 
Granted
—

 
—

 
 
Forfeited
—

 
—

 
 
Exercised
(20
)
 
23.65

 
 
Outstanding June 30, 2019
32

 
$
87.27

 
$
1,478

Vested and Expected to Vest June 30, 2019
32

 
$
87.27

 
$
1,478

Exercisable June 30, 2019
—

 
$
—

 
$
—
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 years

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, 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 July 1, 2018
23

 
81.33

Granted
—

 
—

Vested
(17
)
 
79.41

Forfeited
—

 
—

Outstanding June 30, 2019
6

 
$
87.27
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The following table summarizes non-vested unit awards as of June 30, 2019, 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, 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 July 1, 2018
351

 
83.37

 
 
Granted
80

 
169.53

 
 
Vested
(129
)
 
82.06

 
 
Forfeited
(4
)
 
92.32

 
 
Outstanding June 30, 2019
298

 
$107.00
 
$39,867
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,
 
2019

 
2018

 
2017

Volatility
15.3
%
 
15.6
%
 
16.0
%
Risk free interest rate
2.89
%
 
1.55
%
 
0.93
%
Dividend yield
0.9
%
 
1.2
%
 
1.3
%
Stock Beta
0.669

 
0.687

 
0.684