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Guarantor and Non-Guarantor Financial Information - Balance Sheet (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Current assets:        
Cash and cash equivalents $ 334,764 $ 521,375 $ 741,746 $ 905,561
Short-term investments 45,270 44,491    
Accounts receivable, less reserve of $5,726 at March 31, 2018 and $5,721 at September 30, 2017 545,348 477,074    
Inventories 143,177 137,204    
Prepaid expenses and other 62,424 55,120    
Current assets of discontinued operations   3    
Total current assets 1,130,983 1,235,267    
INVESTMENTS 73,356 84,026    
Net property, plant and equipment, at cost 4,898,525 5,001,051    
Goodwill 69,496 51,705    
Intangible assets, net of amortization 77,001 50,785    
Other assets 12,431 17,154    
TOTAL ASSETS 6,261,792 6,439,988    
CURRENT LIABILITIES:        
Accounts payable 123,012 135,628    
Accrued liabilities 217,095 208,683    
Current liabilities of discontinued operations 78 74    
Total current liabilities 340,185 344,385    
NONCURRENT LIABILITIES:        
Long-term debt 493,433 492,902    
Deferred income taxes 816,669 1,332,689    
Other 93,661 101,409    
Noncurrent liabilities of discontinued operations 14,691 4,012    
Total noncurrent liabilities 1,418,454 1,931,012    
SHAREHOLDERS' EQUITY:        
Common stock 11,201 11,196    
Additional paid-in capital 487,135 487,248    
Retained earnings 4,189,497 3,855,686    
Accumulated other comprehensive income (loss), after tax (5,221) 2,300    
Treasury stock, at cost (179,459) (191,839)    
Total shareholders' equity 4,503,153 4,164,591    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 6,261,792 6,439,988    
Eliminations        
Current assets:        
Accounts receivable, less reserve of $5,726 at March 31, 2018 and $5,721 at September 30, 2017 (76) (5)    
Prepaid expenses and other (63) (442)    
Total current assets (139) (447)    
Intercompany (2,395,599) (2,086,087)    
Investment in subsidiaries (6,150,553) (5,653,432)    
TOTAL ASSETS (8,546,291) (7,739,966)    
CURRENT LIABILITIES:        
Accounts payable (68)      
Accrued liabilities (71) (447)    
Total current liabilities (139) (447)    
NONCURRENT LIABILITIES:        
Intercompany (2,395,499) (2,085,987)    
Total noncurrent liabilities (2,395,499) (2,085,987)    
SHAREHOLDERS' EQUITY:        
Common stock (100) (100)    
Additional paid-in capital (53,476) (53,476)    
Retained earnings (6,098,055) (5,593,218)    
Accumulated other comprehensive income (loss), after tax 978 (6,738)    
Total shareholders' equity (6,150,653) (5,653,532)    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY (8,546,291) (7,739,966)    
Guarantor/Parent | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents (787) (587) (2,681) (955)
Accounts receivable, less reserve of $5,726 at March 31, 2018 and $5,721 at September 30, 2017 794 766    
Prepaid expenses and other 22,718 12,200    
Total current assets 22,725 12,379    
INVESTMENTS 14,976 13,853    
Net property, plant and equipment, at cost 47,706 49,851    
Intercompany 147,333 90,885    
Other assets 5,166 4,955    
Investment in subsidiaries 5,961,792 5,470,050    
TOTAL ASSETS 6,199,698 5,641,973    
CURRENT LIABILITIES:        
Accounts payable 80,251 82,360    
Accrued liabilities 30,356 26,698    
Total current liabilities 110,607 109,058    
NONCURRENT LIABILITIES:        
Deferred income taxes (7,011) (11,201)    
Intercompany 1,566,255 1,354,068    
Other 26,694 25,457    
Total noncurrent liabilities 1,585,938 1,368,324    
SHAREHOLDERS' EQUITY:        
Common stock 11,201 11,196    
Additional paid-in capital 487,135 487,248    
Retained earnings 4,189,497 3,855,686    
Accumulated other comprehensive income (loss), after tax (5,221) 2,300    
Treasury stock, at cost (179,459) (191,839)    
Total shareholders' equity 4,503,153 4,164,591    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 6,199,698 5,641,973    
Issuer Subsidiary | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 324,530 508,091 730,220 899,028
Short-term investments 45,270 44,491    
Accounts receivable, less reserve of $5,726 at March 31, 2018 and $5,721 at September 30, 2017 465,049 411,599    
Inventories 109,527 102,470    
Prepaid expenses and other 4,484 6,383    
Total current assets 948,860 1,073,034    
INVESTMENTS 58,380 70,173    
Net property, plant and equipment, at cost 4,527,404 4,609,144    
Intercompany 2,000,285 1,746,662    
Other assets 1,055 3,839    
Investment in subsidiaries 188,761 183,382    
TOTAL ASSETS 7,724,745 7,686,234    
CURRENT LIABILITIES:        
Accounts payable 39,878 48,679    
Accrued liabilities 172,718 148,491    
Total current liabilities 212,596 197,170    
NONCURRENT LIABILITIES:        
Long-term debt 493,433 492,902    
Deferred income taxes 774,914 1,286,381    
Intercompany 252,200 210,823    
Other 42,574 43,471    
Total noncurrent liabilities 1,563,121 2,033,577    
SHAREHOLDERS' EQUITY:        
Common stock 100 100    
Additional paid-in capital 52,436 52,437    
Retained earnings 5,897,470 5,396,212    
Accumulated other comprehensive income (loss), after tax (978) 6,738    
Total shareholders' equity 5,949,028 5,455,487    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY 7,724,745 7,686,234    
Non-Guarantor Subsidiaries | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 11,021 13,871 $ 14,207 $ 7,488
Accounts receivable, less reserve of $5,726 at March 31, 2018 and $5,721 at September 30, 2017 79,581 64,714    
Inventories 33,650 34,734    
Prepaid expenses and other 35,285 36,979    
Current assets of discontinued operations   3    
Total current assets 159,537 150,301    
Net property, plant and equipment, at cost 323,415 342,056    
Intercompany 247,981 248,540    
Goodwill 69,496 51,705    
Intangible assets, net of amortization 77,001 50,785    
Other assets 6,210 8,360    
TOTAL ASSETS 883,640 851,747    
CURRENT LIABILITIES:        
Accounts payable 2,951 4,589    
Accrued liabilities 14,092 33,941    
Current liabilities of discontinued operations 78 74    
Total current liabilities 17,121 38,604    
NONCURRENT LIABILITIES:        
Deferred income taxes 48,766 57,509    
Intercompany 577,044 521,096    
Other 24,393 32,481    
Noncurrent liabilities of discontinued operations 14,691 4,012    
Total noncurrent liabilities 664,894 615,098    
SHAREHOLDERS' EQUITY:        
Additional paid-in capital 1,040 1,039    
Retained earnings 200,585 197,006    
Total shareholders' equity 201,625 198,045    
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 883,640 $ 851,747