Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
CASH FLOW FROM OPERATING ACTIVITIES:
Net income	$ 198,747	$ 192,733
Adjustments to reconcile net income to net cash provided (used) by operating activities:
Depreciation	27,991	28,967
Amortization of debt issuance costs	1,680	603
Amortization of deferred items	4,084	13,031
Provision for doubtful accounts		(65)
Provision for inventory obsolescence	495	405
Deferred income tax expense (benefit)	(817)	4,876
Share-based compensation expense	5,406	7,639
Other, net	(77)	(1,521)
Changes in assets and liabilities:
Decrease in accounts receivable	6,203	13,151
Decrease in insurance receivable		514
Decrease (increase) in income tax receivable	13,217	(9,094)
Increase in inventory	(4,150)	(3,880)
Decrease in prepaid expenses	11,989	8,334
Increase in deferred costs and other assets	(8,259)	(7,979)
Increase in accounts payable	2,146	4,571
Increase in accrued liabilities	1,340	979
Decrease in income tax payable	(20,250)	(1,002)
Increase (decrease) in deferred credits and other liabilities	29,730	(22,707)
Net cash provided by operating activities	269,475	229,555
CASH FLOW FROM INVESTING ACTIVITIES:
Capital expenditures	(499,241)	(136,870)
Proceeds from insurance		3,374
Proceeds from sale of assets	115	162
Net cash used by investing activities	(499,126)	(133,334)
CASH FLOW FROM FINANCING ACTIVITIES:
Principal payments on debt	(55,000)	(45,000)
Proceeds from debt	225,000
Proceeds from exercise of stock options	4,397	840
Debt issuance costs paid	(12,194)
Net cash provided and used by financing activities	162,203	(44,160)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(67,448)	52,061
CASH AND CASH EQUIVALENTS, at beginning of period	180,523	100,259
CASH AND CASH EQUIVALENTS, at end of period	113,075	152,320
Non-cash activities
Increase (decrease) in accounts payable and accrued liabilities related to capital expenditures	$ (1,499)	$ 14,605