Stock-Based Compensation (Options and Common Shares Reserved for Grant) (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance (in shares) | shares	1,790
Options Outstanding, Granted (in shares) | shares	66
Options Outstanding, Exercised (in shares) | shares	(114)
Options Outstanding, Forfeited / Canceled (in shares) | shares	(34)
Options Outstanding, Ending Balance (in shares) | shares	1,708
Options Outstanding, Exercisable (in shares) | shares	1,012
Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Beginning Balance	$ 17.29
Weighted Average Exercise Price, Granted	40.67
Weighted Average Exercise Price, Exercised	15.24
Weighted Average Exercise Price, Forfeited / Canceled	20.69
Weighted Average Exercise Price, Ending Balance	18.23
Weighted Average Exercise Price, Exercisable	$ 15.60
Weighted Average Remaining Contractual Term [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	4 years 6 months
Weighted Average Remaining Contractual Term, Exercisable	3 years 7 months 6 days
Aggregate Intrinsic Value, Outstanding | $	$ 15,189	[1]
Aggregate Intrinsic Value, Exercisable | $	$ 11,090	[1]
Closing Stock Price	$ 33.68

[1] The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $33.68 as of March 31, 2023, which would have been received by the option holders had all option holders exercised their options as of that date. 14. STOCK-BASED COMPENSATION (CONTINUED)The intrinsic value of an option is the amount by which the fair value of the underlying stock exceeds its exercise price.