Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	May 20, 2019	Sep. 30, 2017
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	928,669
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	1,500,000			1,000,000.0
Treasury Stock, Shares, Acquired	263,160	467,819
Treasury Stock Acquired, Average Cost Per Share	$ 23.29	$ 17.34
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	56,806	97,003
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(208,597)	0	0
Shares, Issued	5,750	22,500
Share-based Payment Arrangement, Cash Used to Settle Award	$ 1,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 312
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	283,195	0	140,668
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	69,338	283,195	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(105,000)	0	(140,668)
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, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 23.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	21,750	44,250	45,750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 6.35	$ 6.39	$ 6.42
Options exercised, shares	5,750	22,500	1,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 5.95	$ 6.43	$ 7.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	16,000	21,750	44,250
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 6.49	$ 6.35	$ 6.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 405	$ 254
2013 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	8,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 5.76
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	2 years 6 months 29 days
Jan 2015 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 7.27
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	4 years 3 months 14 days
Feb 2015 Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	7,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 7.21
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term	4 years 4 months 2 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 2,441	776	$ 256
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	2,984	0	2,201
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 390	300	$ 189
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	(3,435)
Shares, Issued	90,782
Share-based Payment Arrangement, Expense	$ 1,443	$ 1,151
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	45,686
Shares, Outstanding	204,501	162,840
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	528,563	564,822	133,459
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	113,408	216,679
Shares, Issued	1,287,134	884,518	843,993		712,554
Options exercised, shares	5,750	22,500	1,500
Share-based Payment Arrangement, Nonemployee [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued	6,789	1,923
Share-based Payment Arrangement, CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued		283,195
Share Repurchase Program [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	263,160	467,819
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized	3,000,000.0