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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - 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 income $ 88,685 $ 95,293 $ 268,689 $ 356,478
Other comprehensive income (loss), net of income taxes:        
Net change related to employee benefit plans, net of income taxes of $(39.5) thousand and $(118.5) thousand for the three and nine months ended June 30, 2024, respectively, and $(59.6) thousand and $(209.8) thousand for the three and nine months ended June 30, 2023, respectively 134 255 402 767
Unrealized loss on available-for-sale debt security, net of income taxes of $270.9 thousand for the three and nine months ended June 30, 2024, respectively (920) 0 (920) 0
Other comprehensive income (loss) (786) 255 (518) 767
Comprehensive income $ 87,899 $ 95,548 $ 268,171 $ 357,245