CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 272,171	$ 271,674	$ 256,996
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	70,599	43,597	37,030
Amortization of debt issuance costs	3,625	2,363	803
Amortization of deferred items	(4,337)	3,333	13,755
Provision for doubtful accounts	0	0	(65)
Provision for inventory obsolescence	765	735	1,123
Deferred income tax (benefit) expense	(989)	(1,065)	4,798
Share-based compensation expense	10,402	6,314	9,998
Other, net	457	4,847	(1,855)
Changes in assets and liabilities:
(Increase) decrease in accounts receivable	(80,013)	13,214	26,187
Decrease in insurance receivable	0	0	281
(Increase) decrease in income tax receivable	(119)	10,421	(7,746)
Increase in inventory	(23,395)	(6,249)	(3,736)
(Increase) decrease in prepaid expenses	(6,386)	845	(179)
Increase in deferred costs and other assets	(32,597)	(10,379)	(10,321)
Increase (decrease) in accounts payable	27,536	(1,173)	4,735
Increase (decrease) in accrued liabilities	(7,096)	4,440	(854)
Increase (decrease) in income tax payable	1,250	(17,906)	(2,700)
Increase (decrease) in deferred credits and other liabilities	23,730	14,777	(21,850)
Net increase in Operating Capital	(16,568)	68,114	49,404
Net Cash Provided by Operating Activities	255,603	339,788	306,400
Cash flows from investing activities:
Capital expenditures	(785,083)	(514,858)	(187,094)
Collection of insurance receivable	0	0	3,607
Proceeds from sale of assets	7,646	218	1,504
Net Cash Used by Investing Activities	(777,437)	(514,640)	(181,983)
Cash flows from financing activities:
Proceeds from issuance of bonds	450,000	0	0
Principal payments on bank credit facilities	(450,000)	(55,000)	(45,000)
Proceeds from bank credit facilities	310,000	345,000	0
Principal payments on notes payable	(5,461)	(3,631)	0
Proceeds from notes payable	5,148	9,092	0
Debt issuance costs paid	(10,530)	(12,322)	0
Proceeds from exercise of stock options	5,546	6,192	847
Net Cash Provided (Used) by Financing Activities	304,703	289,331	(44,153)
Net increase (decrease) in cash and cash equivalents	(217,131)	114,479	80,264
Cash and cash equivalents, at beginning of period	295,002	180,523	100,259
Cash and cash equivalents, at end of period	$ 77,871	$ 295,002	$ 180,523