Share-Based Compensation - Performance-Based RSUs (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Performance-Based Restricted Stock Units (PBRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 1,600		$ 1,600		$ 900
Number of PBRSUs [Roll Forward]
Compensation expense recognized	$ 117	$ 48	$ 199	$ 48
Performance-Based Restricted Stock Units (PBRSUs)
Number of PBRSUs [Roll Forward]
Shares Awarded, Beginning balance (in shares)			35,732
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			47,928
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period			0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period			1,567
Shares Awarded, Ending balance (in shares)	82,093		82,093
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 27.81		$ 27.81		$ 31.70
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 25.04
Weighted Average Remaining Life, Granted			2 years 10 months 24 days
Aggregate Intrinsic Value, Granted			$ 1,200
Weighted Average Grant Date Fair Value, Exercised/Released (in US$ per share)			$ 0.00
Aggregate Intrinsic Value, Exercised/Released			$ 0
Weighted Average Grant Date Fair Value, Cancelled/Forfeited (in US$ per share)			$ 31.70
Aggregate Intrinsic Value, Cancelled/Forfeited			$ 0
Weighted Average Remaining Life, Ending balance			2 years 6 months	3 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Aggregate Intrinsic Value	$ 1,915		$ 1,915		$ 1,092
Vested and Expected to Vest, Outstanding, Number (in units)	73,095		73,095
Vested and Expected to Vest, Weighted Average Exercise Price (in US$ per share)	$ 27.34		$ 27.34
Vested and Expected to Vest, Weighted Average Remaining Life			2 years 6 months
Vested and Expected to Vest, Aggregate Intrinsic Value	$ 1,705		$ 1,705
2017 Plan [Member] | Performance-Based Restricted Stock Units (PBRSUs)
Number of PBRSUs [Roll Forward]
Employee Service Share-based Compensation, Nonvested Awards, Weighted Average Remaining Amortization Period	2 years 6 months