Equity Based Compensation - Option Activity (Details) - Successor $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Nonvested Options, Weighted Average Exercise Price
Unrecognized compensation costs | $	$ 15,300
Stock option awards
Options
Outstanding, beginning of period (in shares) | shares	0
Exercised (in shares) | shares	0
Granted (in shares) | shares	2,760,500
Forfeited (in shares) | shares	(25,000)
Outstanding, end of period (in shares) | shares	2,735,500
Weighted Average Exercise Price
Outstanding, beginning of period (In dollars per share)	$ 0.00
Exercised (in dollars per share)	0.00
Granted (in dollars per share)	14.67
Forfeited (in dollars per share)	14.52
Outstanding, end of period (In dollars per share)	$ 14.67
Granted, weighted average remaining term (in years)	5 years 9 months 18 days
Granted, aggregate intrinsic value | $	$ 13,934
Forfeited, weighted average remaining term (in years)	5 years 9 months 18 days
Forfeited, aggregate intrinsic value | $	$ 130
Outstanding, weighted average remaining term (in years)	5 years 9 months 18 days
Outstanding, aggregate intrinsic value | $	$ 13,804
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Exercisable (in shares) | shares	0
Exercisable (in dollars per share)	$ 0.00
Exercisable, weighted average remaining term (in years)	0 years
Exercisable, aggregate intrinsic value | $	$ 0
Nonvested Options
Non-vested, beginning of period (in shares) | shares	0
Vested (in shares) | shares	0
Forfeited (in shares) | shares	(25,000)
Non-vested, end of period (in shares) | shares	2,735,500
Nonvested Options, Weighted Average Grant Date Fair Value
Non-vested, beginning of period (in dollars per share)	$ 0.00
Vested (in dollars per share)	0.00
Granted (in dollars per share)	5.93
Forfeited (in dollars per share)	5.86
Non-vested, end of period (in dollars per share)	5.93
Nonvested Options, Weighted Average Exercise Price
Non-vested, beginning of period (in dollar per share)	0.00
Vested (in dollars per share)	0.00
Granted (in dollars per share)	14.67
Forfeited (in dollars per share)	14.52
Non-vested, end of period (in dollars per share)	$ 14.67
Unrecognized compensation costs, period for recognition	2 years 9 months 29 days