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Stock-based Compensation Plans (Schedule of Share-based Compensation. Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, shares	328,099	862,390	1,589,026
Outstanding, Weighted average exercise price (per share)	$ 10.67	$ 6.11	$ 4.89	$ 5.03
Outstanding, Weighted average remaining contractual term, years	7 years 9 months 18 days	2 years 3 months 18 days	2 years	1 year 10 months 24 days
Outstanding, Aggregate intrinsic value	$ 2.7	$ 1.4	$ 5.5	$ 10.3
Exercised, shares	(151,399)	(534,291)	(726,636)
Exercised, Weighted average exercise price (per share)	$ 4.09	$ 4.15	$ 5.20
Exercised, Aggregate intrinsic value	$ 1.7	$ 3.3	$ 4.4
Canceled, shares	(8,421)	0	0
Canceled, Weighted average exercise price (per share)	$ 0	$ 0	$ 0
Stock Options, Exercisable, Number	176,700
Exercisable, Weighted average exercise price (per share)	$ 7.83
Exercisable, Weighted average remaining contractual term, years	2 years 2 months 12 days
Exercisable, Aggregate intrinsic value	$ 1.3
Outstanding, shares	599,799	328,099	862,390	1,589,026
Granted, Weighted average exercise price (per share)	$ 11.86
Granted, shares	431,520

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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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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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