CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 12,979	$ 13,539
Other comprehensive income:
Unrealized gain on pension plan obligation	319	380
Tax effect of unrealized gain on pension plan obligation	(75)	(97)
Unrealized gain on captive insurance collateral	932	355
Tax effect of unrealized gain on captive insurance collateral	(202)	(74)
Unrealized loss on interest rate hedges	(1,042)	(377)
Tax effect of unrealized loss on interest rate hedges	285	102
Total other comprehensive income	217	289
Total comprehensive income	$ 13,196	$ 13,828