Share Based Compensation (Nonvested Share Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Share-based Payment Arrangement [Abstract]
Tax cuts and jobs act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit		$ 3,641
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period	2,379,000	3,335,000	4,300,000
Granted (shares)	823,000	1,114,000	1,380,000
Vested (shares)	(864,000)	(1,559,000)	(2,180,000)
Forfeited (shares)	(172,000)	(511,000)	(165,000)
Nonvested at end of period	2,166,000	2,379,000	3,335,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, nonvested, beginning balance (in dollars per share)	$ 4.96	$ 4.11	$ 1.36
Weighted average grant date fair value, granted (in dollars per share)	6.06	3.87	7.91
Weighted average grant date fair value, vested (in dollars per share)	4.52	2.61	1.20
Weighted average grant date fair value, forfeited (in dollars per share)	4.94	4.38	3.27
Weighted average grant date fair value, nonvested, ending balance (in dollars per share)	$ 5.56	$ 4.96	$ 4.11