Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	May 20, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	100,000,000	100,000,000
Common Stock, Capital Shares Reserved for Future Issuance	817,452
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	1,500,000			1,000,000.0
Treasury Stock, Shares, Acquired	124,205	263,160
Treasury Stock Acquired, Average Cost Per Share	$ 44.40	$ 23.29
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	32,323	56,806
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(13,996)	(208,597)	0
Shares, Issued		5,750
Share-based Payment Arrangement, Cash Used to Settle Award	$ 1,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 167
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	38,936	283,195	0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	0	69,338	283,195
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(8,183)	(105,000)	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	16,757	38,936	283,195
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 21.56
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 145	$ 2,441	$ 776
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	308	2,984	0
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 376	390	300
Performance Based Phantom Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(13,402)
Shares, Issued	163,264
Share-based Payment Arrangement, Expense	$ 2,986	$ 1,443	$ 1,151
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	71,420
Shares, Outstanding	282,942	204,501
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	170,524	528,563	564,822
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	140,280	113,408
Shares, Issued	1,316,998	1,287,134	884,518		843,993
Options exercised, shares	0	5,750	22,500
Share-based Payment Arrangement, Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued	380	6,789
Share Repurchase Program [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired		263,160
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	3,000,000.0