Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure
Income tax expense	$ (2,000,000)	$ 0	$ 0
Tax benefit from gain on postretirement benefits, continuing operations	2,000,000	0	0
Excess tax benefit from share-based compensation	1,200,000
Deferred tax assets	90,181,000	90,123,000	74,610,000
Deferred tax assets, net of deferred tax liabilities	82,400,000
Deferred tax asset, valuation allowance	(83,230,000)	(185,000)	(4,292,000)
Valuation allowance	(1,627,000)	(84,857,000)	(72,613,000)
Valuation allowance increase (decrease)		12,300,000	(9,900,000)
Unrecognized tax benefits	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	0
Income tax penalties and interest expense on unrecognized tax benefits		0	$ 0
Internal Revenue Service (IRS)
Income Tax Disclosure
Operating loss carryforwards	99,700,000
State and Local Jurisdiction
Income Tax Disclosure
Operating loss carryforwards		$ 88,600,000
General Business Tax Credit Carryforward
Income Tax Disclosure
Federal business tax credits	$ 800,000