Earnings per Common Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Basic [Abstract]
Net loss	$ (12,873)	$ (5,495)	$ (20,501)	$ (27,352)
Weighted average shares outstanding - basic (shares)	26,515	26,478	26,422	26,781
Basic EPS (US$ per share)	$ (0.49)	$ (0.21)	$ (0.78)	$ (1.02)
Earnings Per Share, Diluted [Abstract]
Diluted weighted average shares (shares)	26,515	26,478	26,422	26,781
Diluted EPS (US$ per share)	$ (0.49)	$ (0.21)	$ (0.78)	$ (1.02)