CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 350,224	$ 272,171	$ 271,674
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	117,510	70,599	43,597
Amortization of debt issuance costs and bond premium, net	4,184	3,625	2,363
Amortization of deferred items	1,040	(4,337)	3,333
Provision for doubtful accounts	3,871	0	0
Provision for inventory obsolescence	1,711	765	735
Deferred income tax benefit	(816)	(989)	(1,065)
Share-based compensation expense	14,231	10,402	6,314
Other, net	977	457	4,847
Change in assets and liabilities:
Accounts receivable	(36,330)	(80,013)	13,214
Income tax receivable	1,078	(119)	10,421
Inventory	(43,254)	(23,395)	(6,249)
Prepaid expenses	(712)	(6,386)	845
Deferred costs and other assets	(19,706)	(32,597)	(10,379)
Accounts payable	11,440	27,536	(1,173)
Accrued liabilities	1,430	(7,096)	4,440
Bond premium	8,500	0	0
Income tax payable	5,863	1,250	(17,906)
Deferred credits and other liabilities	10,869	23,730	14,777
Net cash provided by operating activities	432,110	255,603	339,788
Cash flows from investing activities:
Capital expenditures	(745,223)	(785,083)	(514,858)
Proceeds from sale of assets	147	7,646	218
Net cash used by investing activities	(745,076)	(777,437)	(514,640)
Cash flows from financing activities:
Proceeds from issuance of bonds	200,000	450,000	0
Proceeds from bank credit facilities	400,000	310,000	345,000
Principal payments on bank credit facilities	(175,000)	(450,000)	(55,000)
Proceeds from notes payable	14,095	5,148	9,092
Principal payments on notes payable	(11,172)	(5,461)	(3,631)
Repurchase and retirement of common shares	(107,260)	0	0
Proceeds from exercise of stock options	9,224	5,546	6,192
Debt issuance costs paid	(6,022)	(10,530)	(12,322)
Net cash provided by financing activities	323,865	304,703	289,331
Net increase (decrease) in cash and cash equivalents	10,899	(217,131)	114,479
Cash and cash equivalents, at beginning of period	77,871	295,002	180,523
Cash and cash equivalents, at end of period	$ 88,770	$ 77,871	$ 295,002