CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 73,495	$ 35,223	$ 31,945
Other comprehensive income (loss):
Unrealized gain on pension plan obligation	1,468	1,291	1,463
Tax effect of unrealized gain on pension plan obligation	(388)	(262)	(405)
Unrealized gain on captive insurance collateral	328	1,849	1,671
Tax effect of unrealized gain on captive insurance collateral	(69)	(390)	(352)
Unrealized loss on interest rate hedge	(319)	(1,928)	(399)
Tax effect of unrealized loss on interest rate hedge	83	512	105
Total other comprehensive income	1,103	1,072	2,083
Total comprehensive income	$ 74,598	$ 36,295	$ 34,028