Stock-Based Compensation (Details) - USD ($) $ in Thousands	6 Months Ended
Mar. 31, 2023	Mar. 31, 2022	Jan. 29, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Stock Options Exercised	$ 1,672	$ 5,598
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	90,985	630,181
Tax withholding for share-based compensation	$ 3,700	$ 6,400
Total intrinsic value of all options exercised	2,600	13,900
Proceeds from employee stock purchase plan transactions	1,170	670
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from Stock Options Exercised	1,700	$ 5,600
Total unrecognized compensation cost nonvested awards	$ 6,500
Weighted average period, unrecognized compensation cost, nonvested awards	1 year 10 months 24 days
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost nonvested restricted stock units	$ 27,900
Weighted average period, unrecognized compensation cost, nonvested awards	2 years 3 months 18 days
The Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized			3,425,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Continuous Days of Service	90 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Hours Per Week Employed	20 hours
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	85.00%
Common shares issued to employees	39,979	36,987
Shares available for future issuance	512,869
Proceeds from employee stock purchase plan transactions	$ 1,200	$ 700
The 2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for future grants	2,340,956

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