CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 13,539	$ 14,489
Other comprehensive income:
Unrealized gain on pension plan obligation	380	224
Tax effect of unrealized gain on pension plan obligation	(97)	(45)
Unrealized gain (loss) on captive insurance collateral	355	(612)
Tax effect of unrealized gain (loss) on captive insurance collateral	(74)	129
Unrealized gain (loss) on interest rate hedges	(377)	718
Tax effect of unrealized gain (loss) on interest rate hedges	102	(193)
Total other comprehensive income	289	221
Total comprehensive income	$ 13,828	$ 14,710