Income Taxes (Detail Textual) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Dec. 21, 2017	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2017
Income Tax [Line Items]
Liability for unrecognized tax benefits		$ 4.1		$ 4.1	$ 4.1			$ 1.7
Unrecognized tax benefit that would impact the company's effective tax rate		$ 4.1		$ 4.1	$ 4.1
Effective tax rate, percentage		31.60%	26.80%		(9.60%)	33.70%
Statutory U.S. Income Tax Rate	35.00%			28.06%
TCJA remeasurement of net deferred tax liabilities		$ 0.0			$ 94.8
TCJA one-time transition tax		0.0			$ 9.7
TCJA one-time transition tax liability payment term					8 years
TCJA overall impact on results of operations		$ (5.7)			$ (98.0)
TCJA overall impact on diluted earnings per share		$ 0.23			$ 3.88
Scenario Plan [Member]
Income Tax [Line Items]
Statutory U.S. Income Tax Rate							21.00%