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Guarantor and Non-Guarantor Financial Information - Cash Flows (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities $ 146,359 $ 492,517
INVESTING ACTIVITIES:    
Capital expenditures (175,303) (180,481)
Purchase of short-term investments (37,899) (21,869)
Proceeds from sale of short-term investments 34,000 21,676
Proceeds from asset sales 13,459 9,715
Net cash used in investing activities (165,743) (170,959)
FINANCING ACTIVITIES:    
Debt issuance costs   (32)
Dividends paid (152,617) (149,300)
Exercise of stock options, net of tax withholding 9,946 (199)
Tax withholdings related to net share settlements of restricted stock (5,679) (3,617)
Excess tax benefit from stock-based compensation 3,919 219
Net cash used in financing activities (144,431) (152,929)
Net increase (decrease) in cash and cash equivalents (163,815) 168,629
Cash and cash equivalents, beginning of period 905,561 729,384
Cash and cash equivalents, end of period 741,746 898,013
Guarantor/Parent | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities (5,634) 3,543
INVESTING ACTIVITIES:    
Capital expenditures (1,343) (12,667)
Intercompany transfers 1,343 12,667
FINANCING ACTIVITIES:    
Intercompany transfers 152,617 149,300
Dividends paid (152,617) (149,300)
Exercise of stock options, net of tax withholding 9,946 (199)
Tax withholdings related to net share settlements of restricted stock (5,679) (3,617)
Excess tax benefit from stock-based compensation (359) (789)
Net cash used in financing activities 3,908 (4,605)
Net increase (decrease) in cash and cash equivalents (1,726) (1,062)
Cash and cash equivalents, beginning of period (955) (838)
Cash and cash equivalents, end of period (2,681) (1,900)
Issuer Subsidiary | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities 144,620 510,685
INVESTING ACTIVITIES:    
Capital expenditures (172,338) (165,291)
Intercompany transfers (1,343) (12,667)
Purchase of short-term investments (37,899) (21,869)
Proceeds from sale of short-term investments 34,000 21,676
Proceeds from asset sales 12,908 8,131
Net cash used in investing activities (164,672) (170,020)
FINANCING ACTIVITIES:    
Debt issuance costs   (32)
Intercompany transfers (152,617) (149,300)
Excess tax benefit from stock-based compensation 3,861 964
Net cash used in financing activities (148,756) (148,368)
Net increase (decrease) in cash and cash equivalents (168,808) 192,297
Cash and cash equivalents, beginning of period 899,028 693,273
Cash and cash equivalents, end of period 730,220 885,570
Non-Guarantor Subsidiaries | Reportable Legal Entities    
CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities 7,373 (21,711)
INVESTING ACTIVITIES:    
Capital expenditures (1,622) (2,523)
Proceeds from asset sales 551 1,584
Net cash used in investing activities (1,071) (939)
FINANCING ACTIVITIES:    
Excess tax benefit from stock-based compensation 417 44
Net cash used in financing activities 417 44
Net increase (decrease) in cash and cash equivalents 6,719 (22,606)
Cash and cash equivalents, beginning of period 7,488 36,949
Cash and cash equivalents, end of period $ 14,207 $ 14,343