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Employee Stock Option Program (EOP), Authorized Shares

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Payout Percent

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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

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

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Number of new stock issued during the period.

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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended				36 Months Ended	84 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2018	Sep. 30, 2022	Sep. 30, 2024	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock reserved for issuance under plan (in shares)	3,000,000.0					3,000,000.0
Stock conversion basis (in shares)				1
Granted (in shares)	50
ESOP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options available under ESOP (in shares)	100,000					100,000
Granted (in shares)						32,118
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding share (In shares)	11,150	13,575	27,507		27,507	11,150	114,259
Unrecognized compensation cost	$ 0.1	$ 0.1				$ 0.1
Weighted average period to recognize remaining cost	1 year 3 months 18 days
Granted (in shares)	50	100	236
Stock options \| 2014 Plan and the 2010 Equity Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Stock options \| 2014 Plan and the 2010 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock options \| ESOP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 6.8	$ 6.9				$ 6.8
Weighted average period to recognize remaining cost	1 year 8 months 12 days
Estimated fair value of nonvested stock (in dollars per share)	$ 24.12	$ 12.83	$ 20.14
Performance share awards to be vested (in shares)	719,499	942,057	848,188		848,188	719,499	1,224,729
Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Stock awards granted in period (in shares)	75,288
Estimated fair value of nonvested stock (in dollars per share)	$ 20.80	$ 14.17	$ 18.98
Performance share awards to be vested (in shares)	303,712	348,223	436,146		436,146	303,712	738,155
Performance-based restricted stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage	0.00%
Performance-based restricted stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage	175.00%
Performance-based restricted stock \| 2020 Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Unrecognized compensation cost	$ 0.1					$ 0.1
Performance share awards to be vested (in shares)	71,470					71,470
Compensation cost related to performance based awards	$ 0.4	$ 1.0	$ 0.6		$ 2.1
Total Shareholder Return Performance Share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout percentage	30.00%
Estimated fair value of nonvested stock (in dollars per share)	$ 28.69
Time-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Estimated fair value of nonvested stock (in dollars per share)	$ 27.14	$ 12.05	$ 21.40
Performance share awards to be vested (in shares)	415,787	593,834	412,042		412,042	415,787	486,574