Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2015
Operating Loss Carryforwards [Line Items]
Effective income tax rate reconciliation, percent	42.00%	0.00%
Income tax expense (benefit)	$ 1.1
Deferred tax assets not to be utilized in future period	$ 7.2
Prior to September 30, 2015 [Member]
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)			$ 0.0
Percentage of valuation allowance, deferred tax assets			100.00%