Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Sep. 30, 2012
ASSETS
Cash and cash equivalents	$ 221,877	$ 77,871
Accounts receivable, net of allowance for doubtful accounts of $4,000 and $0 at June 30, 2013 and September 30, 2012, respectively	179,980	167,186
Income tax receivable	7,141	5,750
Inventories of materials and supplies	100,825	80,290
Prepaid expenses and deferred costs	23,226	39,437
Total current assets	533,049	370,534
Property and equipment, net	3,035,572	2,537,340
Other receivables	11,869	11,875
Deferred costs and other assets	22,823	24,013
Total assets	3,603,313	2,943,762
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	72,622	83,592
Accrued liabilities	32,340	24,478
Notes payable	0	5,148
Income tax payable	16,022	9,711
Deferred credits	13,773	13,738
Total current liabilities	134,757	136,667
LONG TERM LIABILITIES:
Long-term debt	1,338,500	830,000
Deferred income taxes	8,186	8,791
Deferred credits	1,322	8,928
Other	21,867	19,954
Total long-term liabilities	1,369,875	867,673
Commitments and contingencies (Note 11)
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 63,952 and 65,452 issued and outstanding at June 30, 2013 and September 30, 2012, respectively	63,952	65,452
Paid-in capital	176,909	160,540
Retained earnings	1,859,512	1,716,441
Accumulated other comprehensive loss	(1,692)	(3,011)
Total shareholders' equity	2,098,681	1,939,422
Total liabilities and shareholders' equity	$ 3,603,313	$ 2,943,762