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Guarantor and Non-Guarantor Financial Information - Cash Flows (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities $ 492,517 $ 816,568
INVESTING ACTIVITIES:    
Capital expenditures (180,481) (766,029)
Purchase of short-term investments (21,869)  
Proceeds from sales of short-term investments 21,676  
Proceeds from asset sales 9,715 15,155
Net cash provided by (used in) investing activities (170,959) (750,874)
FINANCING ACTIVITIES:    
Dividends paid (149,300) (149,347)
Repurchase of common stock   (59,654)
Proceeds from senior notes, net of discount   497,125
Debt issuance costs (32) (4,334)
Net increase in bank overdraft   12,560
Exercise of stock options, net of tax withholding (199) (1,079)
Tax withholdings related to net share settlements of restricted stock (3,617) (4,248)
Excess tax benefit from stock-based compensation 219 2,761
Net cash provided by (used in) financing activities (152,929) 293,784
Net increase in cash and cash equivalents 168,629 359,478
Cash and cash equivalents, beginning of period 729,384 360,307
Cash and cash equivalents, end of period 898,013 719,785
Guarantor/Parent | Reportable Legal Entities    
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities 3,543 64,996
INVESTING ACTIVITIES:    
Capital expenditures (12,667) (11,571)
Intercompany transfers 12,667 11,571
Proceeds from asset sales   1
Net cash provided by (used in) investing activities   1
FINANCING ACTIVITIES:    
Dividends paid (149,300) (149,347)
Intercompany transfers 149,300 149,347
Repurchase of common stock   (59,654)
Exercise of stock options, net of tax withholding (199) (1,079)
Tax withholdings related to net share settlements of restricted stock (3,617) (4,248)
Excess tax benefit from stock-based compensation (789) 85
Net cash provided by (used in) financing activities (4,605) (64,896)
Net increase in cash and cash equivalents (1,062) 101
Cash and cash equivalents, beginning of period (838) (2,050)
Cash and cash equivalents, end of period (1,900) (1,949)
Issuer Subsidiary | Reportable Legal Entities    
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities 510,685 730,744
INVESTING ACTIVITIES:    
Capital expenditures (165,291) (713,797)
Intercompany transfers (12,667) (11,571)
Purchase of short-term investments (21,869)  
Proceeds from sales of short-term investments 21,676  
Proceeds from asset sales 8,131 14,215
Net cash provided by (used in) investing activities (170,020) (711,153)
FINANCING ACTIVITIES:    
Intercompany transfers (149,300) (149,347)
Proceeds from senior notes, net of discount   497,125
Debt issuance costs (32) (4,334)
Excess tax benefit from stock-based compensation 964 2,653
Net cash provided by (used in) financing activities (148,368) 346,097
Net increase in cash and cash equivalents 192,297 365,688
Cash and cash equivalents, beginning of period 693,273 329,655
Cash and cash equivalents, end of period 885,570 695,343
Non-Guarantor Subsidiaries | Reportable Legal Entities    
CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS    
Net cash provided by (used in) operating activities (21,711) 20,828
INVESTING ACTIVITIES:    
Capital expenditures (2,523) (40,661)
Proceeds from asset sales 1,584 939
Net cash provided by (used in) investing activities (939) (39,722)
FINANCING ACTIVITIES:    
Net increase in bank overdraft   12,560
Excess tax benefit from stock-based compensation 44 23
Net cash provided by (used in) financing activities 44 12,583
Net increase in cash and cash equivalents (22,606) (6,311)
Cash and cash equivalents, beginning of period 36,949 32,702
Cash and cash equivalents, end of period $ 14,343 $ 26,391