CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 89,411	$ 115,921
Other comprehensive income, net of tax
Reclassifications of losses to net income on derivatives designated as hedging instruments, net of tax of $(79) and $(79), respectively	264	263
Adjustment to postemployment benefit obligation, net of tax of $(40) and $(12), respectively	131	41
Other comprehensive income, net of tax	395	304
Comprehensive income	$ 89,806	$ 116,225