Employee Stock Ownership Plan - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Initial term of employer loan					15 years
Employer loan, annual interest rate					3.80%
Compensation Expense	$ 0.7	$ 0.6	$ 0.9	$ 1.8