Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Sep. 30, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 78,980	$ 295,002
Accounts receivable, net of allowance for doubtful accounts	84,380	87,173
Income tax receivable	4,741	5,631
Inventories of materials and supplies	72,848	58,263
Prepaid expenses and deferred costs	9,608	14,862
Total current assets	250,557	460,931
PROPERTY AND EQUIPMENT, net	2,372,446	1,887,321
LONG TERM ASSETS:
Other receivables	11,875	11,875
Deferred costs and other assets	29,367	15,264
Total long-term assets	41,242	27,139
Total assets	2,664,245	2,375,391
CURRENT LIABILITIES:
Accounts payable	72,094	113,021
Accrued liabilities	33,549	30,680
Notes payable	0	5,461
Income tax payable	3,602	8,461
Deferred credits	26,473	1,700
Total current liabilities	135,718	159,323
LONG TERM LIABILITIES:
Long-term debt	655,000	520,000
Deferred income taxes	9,267	9,780
Deferred credits	6,686	7,910
Other	18,287	25,591
Total long-term liabilities	689,240	563,281
SHAREHOLDERS' EQUITY:
Preferred stock, no par value; 1,000 shares authorized, none outstanding	0	0
Common stock, $1 par value, 90,000 shares authorized with 65,363 and 64,960 issued and outstanding at June 30, 2012 and September 30, 2011, respectively	65,363	64,960
Paid-in capital	155,652	145,084
Retained earnings	1,620,915	1,444,270
Accumulated other comprehensive loss	(2,643)	(1,527)
Total shareholders' equity	1,839,287	1,652,787
Total liabilities and shareholders' equity	$ 2,664,245	$ 2,375,391