CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 30, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 306,426	$ 521,375
Short-term investments	44,279	44,491
Accounts receivable, net of allowance of $5,786 and $5,721, respectively	565,321	477,074
Inventories	152,109	137,204
Prepaid expenses and other	65,343	55,120
Current assets - discontinued operations		3
Total current assets	1,133,478	1,235,267
NONCURRENT ASSETS:
Investments	92,702	84,026
Property, plant and equipment, net	4,883,378	5,001,051
Goodwill	69,496	51,705
Intangible assets, net	75,564	50,785
Other assets	11,254	17,154
Total noncurrent assets	5,132,394	5,204,721
TOTAL ASSETS	6,265,872	6,439,988
CURRENT LIABILITIES:
Accounts payable	143,732	135,628
Accrued liabilities	237,935	208,683
Current liabilities - discontinued operations	1	74
Total current liabilities	381,668	344,385
NONCURRENT LIABILITIES:
Long-term debt less unamortized discount and debt issuance costs	493,700	492,902
Deferred income taxes	833,738	1,332,689
Other	99,727	101,409
Noncurrent liabilities - discontinued operations	14,548	4,012
Total noncurrent liabilities	1,441,713	1,931,012
SHAREHOLDERS' EQUITY:
Common stock, $.10 par value, 160,000,000 shares authorized, 112,008,961 shares and 111,956,875 shares issued as of June 30, 2018 and September 30, 2017, respectively, and 108,943,554 shares and 108,604,047 shares outstanding as of June 30, 2018 and September 30, 2017, respectively	11,201	11,196
Preferred stock, no par value, 1,000,000 shares authorized, no shares issued
Additional paid-in capital	494,604	487,248
Retained earnings	4,103,418	3,855,686
Accumulated other comprehensive income	8,942	2,300
Total shareholders' equity before treasury stock	4,618,165	4,356,430
Treasury stock, at cost	(175,674)	(191,839)
Total shareholders' equity	4,442,491	4,164,591
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 6,265,872	$ 6,439,988