CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 85,911	$ 68,374	$ 118,795	$ 81,353
Other comprehensive income:
Unrealized gain on pension plan obligation	432	319	864	638
Tax effect of unrealized gain on pension plan obligation	(33)	(85)	(228)	(160)
Unrealized gain on captive insurance collateral	125	263	171	1,195
Tax effect of unrealized gain on captive insurance collateral	(27)	(50)	(36)	(252)
Unrealized gain (loss) on interest rate hedges	(636)	221	(3)	(821)
Tax effect of unrealized gain (loss) on interest rate hedges	168	(65)	1	220
Total other comprehensive income	29	603	769	820
Total comprehensive income	$ 85,940	$ 68,977	$ 119,564	$ 82,173