Share-based Compensation and Employee Benefit Plans - PSU Activity (Details) - PSUs	9 Months Ended
	Jun. 30, 2017 $ / shares shares
Non-Vested Equity Plan Units
Outstanding at the beginning of the period (in shares) | shares	1,542,500
Granted (in shares) | shares	212,000
Vested (in shares) | shares	0
Forfeited/Canceled (in shares) | shares	(187,500)
Outstanding at the end of the period (in shares) | shares	1,567,000
Non-Vested Equity Plan, Average Grant Date Fair Value Per Unit
Outstanding at the beginning of the period (in USD per share) | $ / shares	$ 9.12
Granted (in USD per share) | $ / shares	7.66
Vested (in USD per share) | $ / shares	0.00
Forfeited/Canceled (in USD per share) | $ / shares	9.05
Outstanding at the end of the period (in USD per share) | $ / shares	$ 8.93