Stock-Based Compensation - Stock Options (Details) - $ / shares	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Total outstanding Options at beginning of year (in shares)	104,000	0
Options granted (in shares)	40,000	104,000
Options exercised (in shares)	0	0
Options cancelled (in shares)	0	0
Outstanding Options at end of year (in shares)	144,000	104,000
Exercisable at end of year (in shares)	26,000	0
Vested and expected to vest at end of year (in shares)	118,000	104,000
Price per share
Total outstanding Options at beginning of year (in dollars per share)	$ 25.85	$ 0.00
Options granted (in dollars per share)	30.87	25.85
Options exercised (in dollars per share)	0.00	0.00
Options cancelled (in dollars per share)	0.00	0.00
Outstanding Options at end of year (in dollars per share)	27.24	25.85
Exercisable at end of year (in dollars per share)	25.85	0.00
Vested and expected to vest at end of year (in dollars per share)	$ 27.24	$ 25.85