CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 115,921	$ 111,312
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	263	264
Adjustment to postemployment benefit obligation, net of tax of $(12) and $(233), respectively	41	766
Other comprehensive income	304	1,030
Comprehensive income	$ 116,225	$ 112,342