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Stock-Based Compensation (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Jan. 29, 2021	Jan. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	106,012	102,392	116,195
Proceeds from employee stock purchase plan transactions	$ 2,263	$ 1,500	$ 1,214
Total intrinsic value of all options exercised	5,200	20,300	6,500
Total grant date fair value of shares vested	4,500	3,000	2,600
Proceeds from Stock Options Exercised	3,926	9,505	8,525
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	200	4,300
Total unrecognized compensation cost nonvested awards	$ 4,900
Weighted average period, unrecognized compensation cost, nonvested awards	1 year 9 months 18 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	$ 4,100	2,400	2,100
Weighted average period, unrecognized compensation cost, nonvested awards	2 years 1 month 6 days
Total unrecognized compensation cost, restricted stock units	$ 19,300
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of continuous days of service	90 days
Number of hours per week employed	20 hours
Percent of market value	85.00%
Proceeds from employee stock purchase plan transactions	$ 2,300	$ 1,500	$ 1,200
Common shares issued to employees	82,621	80,225	78,644
Shares available for future issuance	470,227
The Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized					3,425,000
The 2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grants	2,365,365
Number of shares authorized				3,500,000
The 2021 Plan | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	7 years
Vesting period	4 years
Director | The 2021 Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	1 year
Vesting period	4 years
Director | The 2021 Plan | Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Executives and Employees | The 2021 Plan | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years

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