Share-Based Compensation (Nonvested Share Activity) (Details)	6 Months Ended
	Mar. 31, 2022 $ / shares shares
Shares
Unvested at beginning of period | shares	1,901,000
Granted (shares) | shares	2,000
Vested (shares) | shares	(812,000)
Forfeited (shares) | shares	(28,000)
Unvested at end of period | shares	1,063,000
Weighted Average Grant Date Fair Value/Share
Weighted average grant date fair value, nonvested, beginning balance (in dollars per share) | $ / shares	$ 6.69
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	24.22
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	6.55
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	6.60
Weighted average grant date fair value, nonvested, ending balance (in dollars per share) | $ / shares	$ 6.87