Share-Based Compensation (Nonvested Share Activity) (Details)	6 Months Ended
	Mar. 31, 2021 $ / shares shares
Shares
Nonvested at beginning of period | shares	2,166,000
Granted (shares) | shares	611,000
Vested (shares) | shares	(778,000)
Forfeited (shares) | shares	(7,000)
Nonvested at end of period | shares	1,992,000
Weighted Average Grant Date Fair Value/Share
Weighted average grant date fair value, nonvested, beginning balance (in dollars per share) | $ / shares	$ 5.56
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	8.98
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	5.56
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	6.47
Weighted average grant date fair value, nonvested, ending balance (in dollars per share) | $ / shares	$ 6.60