Unaudited Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net income	$ 281,879	$ 228,622
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	129,637	107,376
Amortization	5,179	5,876
Provision for doubtful accounts and inventory obsolescence	3,337	1,905
Deferred income tax benefit	(3,453)	(649)
Share-based compensation expense	9,277	10,924
Asset impairment	60,777	0
(Gain) loss on sale of assets	15,362	(34,072)
Changes in assets and liabilities:
Accounts receivable	(17,917)	(5,069)
Income tax receivable	(3,868)	(1,425)
Inventories of materials and supplies	(16,917)	(8,816)
Prepaid expenses, deferred costs and other current assets	13,274	14,100
Deferred costs and other assets	(341)	(10,512)
Accounts payable	(17,511)	(11,303)
Accrued liabilities	24,049	15,118
Income tax payable	(5,450)	6,032
Deferred credits and other liabilities	6,291	21,141
Net cash provided by operating activities	483,605	339,248
Cash flows from investing activities:
Capital expenditures	(420,077)	(564,119)
Proceeds from sale of assets	2,339	61,516
Net cash used in investing activities	(417,738)	(502,603)
Cash flows from financing activities:
Borrowings from credit facilities	225,000	370,000
Repayments on credit facilities	(250,000)	(165,000)
Repayments on short-term debt, net	(11,885)	(8,071)
Dividends paid	(32,397)	0
Proceeds from exercise of stock options	1,279	3,468
Debt issuance costs paid	(3,440)	(6,650)
Net cash (used) provided by financing activities	(71,443)	193,747
Net increase (decrease) in cash and cash equivalents	(5,576)	30,392
Cash and cash equivalents, at beginning of period	80,080	88,770
Cash and cash equivalents, at end of period	74,504	119,162
Non-cash activities:
Decrease in accounts payable and accrued liabilities related to capital expenditures	$ (15,501)	$ (13,573)