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Stock-Based Compensation - Stock Options (Details)
 6 Months Ended
Dec. 31, 2018
$ / shares
shares
Shares  
Total outstanding options at beginning of year (in shares) | shares 144,000
Options granted (in shares) | shares 50,000
Options exercised (in shares) | shares (28,500)
Outstanding options at end of period (in shares) | shares 165,500
Price or range per share  
Total outstanding options at beginning of year (in dollars per share) $ 27.24
Options granted (in dollars per share) 42.13
Options exercised (in dollars per share) (26.29)
Total outstanding options at end of year (in dollars per share) $ 31.91
Exercisable at end of period (in shares) | shares 7,500
Exercisable at end of period (in dollars per share) $ 30.87
Minimum  
Price or range per share  
Options exercised (in dollars per share) (25.85)
Total outstanding options at end of year (in dollars per share) 25.85
Maximum  
Price or range per share  
Options exercised (in dollars per share) (30.87)
Total outstanding options at end of year (in dollars per share) $ 42.13