Share-Based Incentive Plans - Summary of Transactions Relating to Options (Details) - Stock Option Awards - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Number of Shares
Options outstanding at the beginning of year	3,698,000	3,957,000	3,516,000
Granted during year	12,000	537,000	621,000
Exercised during the year	0	(3,105)	(3,000)
Forfeited or expired during year	(1,015,000)	(793,000)	(177,000)
Options outstanding at the end of year	2,695,000	3,698,000	3,957,000	3,516,000
Exercisable at June 30, 2020	1,920,000
Weighted-Average Exercise Price
Options outstanding at the beginning of year	$ 5.63	$ 6.30	$ 7.02
Granted during year	1.64	3.22	2.46
Exercised during the year		2.10	1.24
Forfeited or expired during year	6.22	7.38	7.21
Options outstanding at the end of year	5.33	$ 5.63	$ 6.30	$ 7.02
Exercisable at June 30, 2020	$ 6.11
Weighted-Average Remaining Contractual Term (Years)
Options outstanding at the end of year	6 years 1 month 9 days	7 years 1 month 6 days	7 years 2 months 15 days	7 years 10 months 9 days
Exercisable at June 30, 2020	5 years 6 months 14 days
Aggregate Intrinsic Value
Options outstanding at the end of year			$ 475	$ 2