Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 117,707	$ 77,871
Accounts receivable, net of allowance for doubtful accounts of $1,545 and $0 at March 31, 2013 and September 30, 2012, respectively	140,759	167,186
Income tax receivable	5,949	5,750
Inventories of materials and supplies	94,036	80,290
Prepaid expenses and deferred costs	24,686	39,437
Total current assets	383,137	370,534
Property and equipment, net	2,888,235	2,537,340
Other receivables	11,868	11,875
Deferred costs and other assets	22,506	24,013
Total assets	3,305,746	2,943,762
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	73,774	83,592
Accrued liabilities	18,955	24,478
Notes payable	0	5,148
Income tax payable	16,293	9,711
Deferred credits	14,274	13,738
Total current liabilities	123,296	136,667
LONG TERM LIABILITIES:
Long-term debt	1,040,000	830,000
Deferred income taxes	8,325	8,791
Deferred credits	3,741	8,928
Other	21,555	19,954
Total long-term liabilities	1,073,621	867,673
Commitments and contingencies (Note 10)
Shareholders’ equity:
Preferred stock, no par value, 1,000 shares authorized, none outstanding	0	0
Common stock, $1.00 par value, 90,000 shares authorized with 65,779 and 65,452 issued and outstanding at March 31, 2013 and September 30, 2012, respectively	65,779	65,452
Paid-in capital	170,444	160,540
Retained earnings	1,874,791	1,716,441
Accumulated other comprehensive loss	(2,185)	(3,011)
Total shareholders' equity	2,108,829	1,939,422
Total liabilities and shareholders' equity	$ 3,305,746	$ 2,943,762