Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Operating loss carryforwards disclosures
Blended U.S federal statutory rate	28.10%	35.00%	35.00%
Tax Cuts and Jobs Act, provisional net benefit for re-measurement of deferred tax assets and liabilities	$ 78,900,000
Reduction in valuation allowance amount	5,400,000
Amount of future tax benefits	3,000,000
Undistributed earnings of foreign subsidiaries	93,800,000
Tax Cuts and Jobs Act of 2017, tax expense for transition tax	5,000,000
Unrecognized tax benefits	0	$ 0	$ 0
State
Operating loss carryforwards disclosures
Net operating loss carryforwards expiring between 2019 and 2037	$ 339,900,000