Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 248,331	$ 176,645
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	86,412	46,419
Amortization of debt issuance costs and bond premium	3,083	2,590
Amortization of deferred items	1,227	3,736
Provision for doubtful accounts	3,510	540
Provision for inventory obsolescence	1,530	615
Deferred income tax benefit	(605)	(513)
Share-based compensation expense	10,418	7,709
Other, net	(67)	1,137
Changes in assets and liabilities:
Accounts receivable	(18,297)	2,253
Income tax receivable	(1,391)	890
Inventory	(22,065)	(15,200)
Prepaid expenses	12,788	6,186
Deferred costs and other assets	(9,519)	(22,343)
Accounts payable	(10,970)	20,467
Accrued liabilities	(6,745)	2,356
Bond premium	8,500	0
Income tax payable	6,311	(4,859)
Deferred credits and other liabilities	9,989	10,006
Net cash provided by operating activities	322,440	238,634
Cash flows from investing activities:
Capital expenditures	(569,696)	(594,789)
Proceeds from sale of assets	129	7,513
Net cash used in investing activities	(569,567)	(587,276)
Cash flows from financing activities:
Proceeds from issuance of bonds	200,000	450,000
Proceeds from bank credit facilities	400,000	135,000
Principal payments on bank credit facilities	(100,000)	(450,000)
Principal payments on notes payable	(5,148)	(5,461)
Repurchase and retirement of common shares	(107,260)	0
Proceeds from exercise of stock options	6,451	3,262
Debt issuance costs paid	2,910	181
Net cash provided by financing activities	391,133	132,620
Net increase (decrease) in cash and cash equivalents	144,006	(216,022)
Cash and cash equivalents, at beginning of period	77,871	295,002
Cash and cash equivalents, at end of period	$ 221,877	$ 78,980