CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (11,574)	$ 1,532	$ 198,649	$ 227,700
Other comprehensive (loss) income, net of tax
Reclassifications of losses to net income on derivatives designated as hedging instruments, net of tax of $(79), $(79), $(238) and $(238), respectively	264	263	790	790
Adjustment to postemployment benefit obligation, net of tax of $112, $(12), $(2,836) and $(37), respectively	(369)	41	9,386	123
Other comprehensive (loss) income, net of tax	(105)	304	10,176	913
Comprehensive (loss) income	$ (11,679)	$ 1,836	$ 208,825	$ 228,613