Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Diluted:
Incorporation period of shares related to business combination		22 days
Successor
Basic:
Net loss	$ (15.5)	$ (17.1)
Weighted average number of common shares outstanding during the period (in shares)	34,072,056	21,241,897
Net loss per common share - basic (USD per share)	$ (0.45)	$ (0.81)
Diluted:
Net loss	$ (15.5)	$ (17.1)
Weighted average number of common shares outstanding during the period (in shares)	34,072,056	21,241,897
Incremental common shares attributable to outstanding dilutive options and unvested restricted shares (in shares)	0	0
Denominator for diluted earnings per common share (in shares)	34,072,056	21,241,897
Net loss per common share - diluted (USD per share)	$ (0.45)	$ (0.81)