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Stock-Based Compensation (Options and Common Shares Reserved for Grant) (Details) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Options Outstanding [Roll Forward]
Options Outstanding, Beginning Balance | shares	3,393
Options Outstanding, Granted | shares	531
Options Outstanding, Exercised | shares	(742)
Options Outstanding, Forfeited / Cancelled | shares	(230)
Options Outstanding, Ending Balance | shares	2,952
Options Outstanding, Exercisable | shares	1,927
Weighted Average Exercise Price [Roll Forward]
Weighted Average Exercise Price, Beginning Balance	$ 12.20
Weighted Average Exercise Price, Granted	17.78
Weighted Average Exercise Price, Exercised	11.47
Weighted Average Exercise Price, Forfeited / Cancelled	14.66
Weighted Average Exercise Price, Ending Balance	13.20
Weighted Average Exercise Price, Exercisable	$ 11.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted Average Remaining Contractual Term, Outstanding	3 years 7 months 6 days
Weighted Average Remaining Contractual Term, Exercisable	2 years 6 months
Aggregate Intrinsic Value, Outstanding | $	$ 23,232
Aggregate Intrinsic Value, Exercisable | $	$ 18,246
Closing Stock Price	$ 21.02

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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