Equity Based Compensation - Restricted Stock (Details) - Successor - Restricted stock awards $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares) | shares	0
Vested (in shares) | shares	0
Granted (in shares) | shares	256,597
Canceled (in shares) | shares	0
Outstanding, end of period (in shares) | shares	256,597
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 0.00
Vested (in dollars per share) | $ / shares	0.00
Granted (in dollars per share) | $ / shares	20.03
Canceled (in dollar per share) | $ / shares	0.00
Outstanding, end of period (in dollars per share) | $ / shares	$ 20.03
Unrecognized compensation costs | $	$ 4.7
Unrecognized compensation costs, period for recognition	2 years 6 months 22 days