Long-Term Debt - Narrative (Details) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended		14 Months Ended	16 Months Ended	18 Months Ended	38 Months Ended
	Apr. 03, 2020	Nov. 20, 2019	Mar. 31, 2020	Mar. 31, 2020	Sep. 30, 2023	Sep. 30, 2022	Nov. 20, 2024	Sep. 30, 2021	Sep. 30, 2021	Nov. 20, 2024	Jun. 17, 2020	Jun. 16, 2020	May 09, 2018
Line of Credit Facility [Line Items]
Indebtedness			$ 87,431,000	$ 87,431,000
Unamortized debt issuance costs			1,300,000	1,300,000
Letters of credit outstanding			3,200,000	$ 3,200,000
Subsequent Event
Line of Credit Facility [Line Items]
Indebtedness											$ 95,900,000
Cash on hand											$ 62,400,000
Forecast
Line of Credit Facility [Line Items]
Quarterly principal payments					$ 531,250	$ 375,000	$ 625,000		$ 187,500
Minimum
Line of Credit Facility [Line Items]
Interest rate during period				3.57%
Maximum
Line of Credit Facility [Line Items]
Interest rate during period				6.25%
2018 Letter of Credit Subfacility
Line of Credit Facility [Line Items]
Maximum borrowing capacity													$ 15,000,000.0
2018 Swingline Subfacility
Line of Credit Facility [Line Items]
Maximum borrowing capacity													10,000,000.0
Amended 2018 Credit Facility | Federal Funds Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.50%
Amended 2018 Credit Facility | Prime Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.00%
Amended 2018 Credit Facility | Minimum
Line of Credit Facility [Line Items]
Commitment fee percentage		0.20%
Amended 2018 Credit Facility | Minimum | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.00%
Amended 2018 Credit Facility | Minimum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.00%
Amended 2018 Credit Facility | Maximum
Line of Credit Facility [Line Items]
Commitment fee percentage		0.35%
Amended 2018 Credit Facility | Maximum | LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.75%
Amended 2018 Credit Facility | Maximum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		1.75%
Second Amended 2018 Credit Facility | LIBOR | Forecast
Line of Credit Facility [Line Items]
Basis spread on variable rate								3.25%
Second Amended 2018 Credit Facility | Minimum | LIBOR | Forecast
Line of Credit Facility [Line Items]
Basis spread on variable rate										2.00%
Second Amended 2018 Credit Facility | Maximum | LIBOR | Forecast
Line of Credit Facility [Line Items]
Basis spread on variable rate										3.00%
Revolving Credit Facility | 2018 Term Loan Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity													25,000,000.0
Revolving Credit Facility | 2018 Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity													65,000,000.0
Revolving Credit Facility | Amended 2018 Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 75,000,000.0
Capital expenditure limit in next fiscal year per agreement		37,000,000.0
Capital expenditure limit after next fiscal year per agreement		$ 45,000,000.0
Proceeds from line of credit			$ 47,000,000.0
Revolving Credit Facility | Amended 2018 Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Proceeds from line of credit	$ 8,500,000
Revolving Credit Facility | Second Amended 2018 Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Capital expenditure limit in current fiscal year per agreement												$ 12,000,000.0
Capital expenditure limit in next fiscal year per agreement												12,000,000.0
Capital expenditure limit in 2022 per agreement												34,000,000.0
Capital expenditure limit in 2023 per agreement												37,000,000.0
Capital expenditure limit after 2023 per agreement												$ 45,000,000.0
Letter of Credit | 2018 Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity													$ 75,000,000.0