CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Current Assets:
Cash and cash equivalents	$ 217,341	$ 257,174
Restricted cash	68,902	59,064
Short-term investments	292,919	93,600
Accounts receivable, net of allowance of $2,977 and $2,688, respectively	418,604	404,188
Inventories of materials and supplies, net	117,884	94,227
Prepaid expenses and other, net	76,419	97,727
Assets held-for-sale	0	645
Total current assets	1,192,069	1,006,625
Investments, net	100,567	264,947
Property, plant and equipment, net	3,016,277	2,921,695
Other Noncurrent Assets:
Goodwill	45,653	45,653
Intangible assets, net	54,147	60,575
Operating lease right-of-use assets	67,076	50,400
Restricted cash	1,242,417	0
Other assets, net	63,692	32,061
Total other noncurrent assets	1,472,985	188,689
Total assets	5,781,898	4,381,956
Current Liabilities:
Accounts payable	135,084	130,852
Dividends payable	25,024	25,194
Accrued liabilities	286,841	262,885
Total current liabilities	446,949	418,931
Noncurrent Liabilities:
Long-term debt, net	1,782,182	545,144
Deferred income taxes	495,481	517,809
Other	140,134	128,129
Total noncurrent liabilities	2,417,797	1,191,082
Commitments and Contingencies (Note 16)
Shareholders' Equity:
Common stock, $0.10 par value, 160,000,000 shares authorized, 112,222,865 shares issued as of September 30, 2024 and 2023, and 98,755,412 and 99,426,526 shares outstanding as of September 30, 2024 and 2023, respectively	11,222	11,222
Preferred stock, no par value, 1,000,000 shares authorized, no shares issued	0	0
Additional paid-in capital	518,083	525,369
Retained earnings	2,883,590	2,707,715
Accumulated other comprehensive loss	(6,350)	(7,981)
Treasury stock, at cost, 13,467,453 shares and 12,796,339 shares as of September 30, 2024 and 2023, respectively	(489,393)	(464,382)
Total shareholders’ equity	2,917,152	2,771,943
Total liabilities and shareholders' equity	$ 5,781,898	$ 4,381,956