Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Sep. 30, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 89,923	$ 295,002
Accounts receivable	119,683	87,173
Income tax receivable	3,991	5,631
Inventories of materials and supplies	51,902	58,263
Prepaid expenses and deferred costs	14,701	14,862
Total current assets	280,200	460,931
NET PROPERTY AND EQUIPMENT	2,046,214	1,887,321
LONG TERM ASSETS:
Other receivables	11,876	11,875
Deferred costs and other assets	15,076	15,264
Total long-term assets	26,952	27,139
Total assets	2,353,366	2,375,391
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	35,736	113,021
Accrued liabilities	21,780	30,680
Notes payable		5,461
Income tax payable	11,710	8,461
Deferred credits	1,063	1,700
Total current liabilities	70,289	159,323
Long-term debt	520,000	520,000
Deferred income taxes	9,594	9,780
Deferred credits	7,168	7,910
Other	26,399	25,591
Total long-term liabilities	563,161	563,281
COMMITMENTS AND CONTINGENCIES (SEE NOTE 10)
SHAREHOLDERS' EQUITY:
Preferred stock, no par value; 1,000 shares authorized, none outstanding
Common stock, $1 par value, 90,000 shares authorized with 65,152 and 64,960 issued and outstanding at December 31, 2011 and September 30, 2011, respectively	65,152	64,960
Paid-in capital	146,761	145,084
Retained earnings	1,509,738	1,444,270
Accumulated other comprehensive loss	(1,735)	(1,527)
Total shareholders' equity	1,719,916	1,652,787
Total liabilities and shareholders' equity	$ 2,353,366	$ 2,375,391