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Long-Term Debt and Revolving Line of Credit - Other Information (Details) - USD ($)					3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 28, 2020	Jul. 15, 2020	Apr. 03, 2018	Jan. 25, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 17, 2021	Aug. 14, 2017
Debt Instrument
Outstanding Loan					$ 295,203,000		$ 295,203,000		$ 298,780,000
Amount borrowed								$ 19,880,000
Variable Interest Term Loan
Debt Instrument
Principal amount											$ 250,000,000
Additional borrowings			$ 40,000,000	$ 25,000,000
Interest paid on loan					2,773,000	$ 2,974,000	8,444,000	11,047,000
Accrued interest payable					30,000		30,000		32,000
Revolving Line of Credit
Debt Instrument
Maximum borrowing capacity of revolving line of credit										$ 100,000,000	20,000,000
Available borrowings					$ 100,000,000		$ 100,000,000		$ 20,000,000	$ 80,000,000
Effective interest rate (as a percent)					3.68%		3.68%		4.48%
Interest paid on loan							$ 93,000	457,000
Accrued interest payable					$ 1,000		1,000		$ 0
Prepayment on the loan					$ 755,000				1,527,000
Standby letter of credit
Debt Instrument
Available borrowings											10,000,000
letters of credit outstanding									$ 120,000
Fixed Rate Term Loan
Debt Instrument
Principal amount											$ 100,000,000
Interest rate (as a percent)											8.25%
Interest paid on loan							$ 0	$ 8,388,000
Accrued interest payable	$ 3,000,000
Prepayment on the loan	$ 80,000,000	$ 20,000,000
Outstanding Loan		$ 80,000,000

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