CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022	Jul. 01, 2022
Accumulated depreciation	$ 175,820	$ 171,843	$ 170,201
Treasury stock (in shares)	25,380	45,961	45,961
Class A
Common stock, issued (in shares)	9,043,151	8,984,253	8,965,300
Common stock, shares outstanding (in shares)	9,043,151	8,984,253	8,965,300
Class B
Common stock, issued (in shares)	1,207,798	1,207,798	1,207,798
Common stock, shares outstanding (in shares)	1,207,798	1,207,798	1,207,798