CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 31,945	$ 35,288	$ 87,737
Other comprehensive income (loss):
Unrealized gain (loss) on pension plan obligation	1,463	(436)	735
Tax effect of unrealized gain (loss) on pension plan obligation	(405)	129	(217)
Unrealized gain (loss) on captive insurance collateral	1,671	(4,952)	(963)
Tax effect of unrealized gain (loss) on captive insurance collateral	(352)	1,043	203
Unrealized gain (loss) on interest rate hedge	(399)	3,607	1,575
Tax effect of unrealized gain (loss) on interest rate hedge	105	(959)	(414)
Total other comprehensive income (loss)	2,083	(1,568)	919
Total comprehensive income	$ 34,028	$ 33,720	$ 88,656