Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Current Assets:
Cash and cash equivalents	$ 336,089	$ 347,943
Short-term investments	45,655	52,960
Accounts receivable, net of allowance of $3,108 and $9,927, respectively	531,556	495,602
Inventories of materials and supplies, net	112,474	149,653
Prepaid expenses and other	94,342	68,928
Total current assets	1,120,116	1,115,086
Investments	20,300	31,991
Property, plant and equipment, net	3,840,213	4,502,084
Other Noncurrent Assets:
Goodwill	45,653	82,786
Intangible assets, net	84,533	86,716
Operating lease right-of-use asset	48,730	0
Other assets	17,209	20,852
Total other noncurrent assets	196,125	190,354
Total assets	5,176,754	5,839,515
Current Liabilities:
Accounts payable	144,794	123,146
Accrued liabilities	232,625	287,092
Total current liabilities	377,419	410,238
Noncurrent Liabilities:
Long-term debt, net	479,811	479,356
Deferred income taxes	700,360	806,611
Other	142,664	115,746
Noncurrent liabilities - discontinued operations	15,494	15,341
Total noncurrent liabilities	1,338,329	1,417,054
Commitments and Contingencies (Note 16)
Shareholders' Equity:
Common stock, $.10 par value, 160,000,000 shares authorized,112,151,563 and 112,080,262 shares issued as of March 31, 2020 and September 30, 2019, respectively, and 107,418,296 and 108,437,904 shares outstanding as of March 31, 2020 and September 30, 2019, respectively	11,215	11,208
Preferred stock, no par value, 1,000,000 shares authorized, no shares issued	0	0
Additional paid-in capital	509,928	510,305
Retained earnings	3,168,966	3,714,307
Accumulated other comprehensive loss	(27,603)	(28,635)
Treasury stock, at cost, 4,733,267 shares and 3,642,358 shares as of March 31, 2020 and September 30, 2019, respectively	(201,500)	(194,962)
Total shareholders’ equity	3,461,006	4,012,223
Total liabilities and shareholders' equity	$ 5,176,754	$ 5,839,515

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).