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INCOME TAXES (Tables) | 12 Months Ended
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Sep. 30, 2015
INCOME TAXES |
Schedule of components of the provision for income taxes |
|  | Years Ended September 30, |
|  | 2015 |  | 2014 |  | 2013 |
|  | (in thousands) |
Current: |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 84,229 |  | $ | 323,386 |  | $ | 315,820 |
Foreign |  |  | 16,685 |  |  | 15,841 |  |  | 14,551 |
State |  |  | 10,881 |  |  | 21,197 |  |  | 32,916 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 111,795 |  |  | 360,424 |  |  | 363,287 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred: |  |  |  |  |  |  |  |  |  |
Federal |  |  | 159,686 |  |  | 28,183 |  |  | 35,530 |
Foreign |  |  | (28,456 | ) |  | (3,265 | ) |  | (1,409 | )
State |  |  | 350 |  |  | 2,206 |  |  | (4,564 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 131,580 |  |  | 27,124 |  |  | 29,557 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total provision |  | $ | 243,375 |  | $ | 387,548 |  | $ | 392,844 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of domestic and foreign income before income taxes |
|  | Years Ended September 30, |
|  | 2015 |  | 2014 |  | 2013 |
|  | (in thousands) |
Domestic |  | $ | 676,146 |  | $ | 1,061,006 |  | $ | 1,071,435 |
Foreign |  |  | (10,499 | ) |  | 35,308 |  |  | 42,862 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 665,647 |  | $ | 1,096,314 |  | $ | 1,114,297 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of components of net deferred tax liabilities |
|  | September 30, |
|  | 2015 |  | 2014 |
|  | (in thousands) |
Deferred tax liabilities: |  |  |  |  |  |  |
Property, plant and equipment |  | $ | 1,334,611 |  | $ | 1,187,774 |
Available-for-sale securities |  |  | 33,187 |  |  | 83,787 |
Other |  |  | 3,928 |  |  | 67 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax liabilities |  |  | 1,371,726 |  |  | 1,271,628 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets: |  |  |  |  |  |  |
Pension reserves |  |  | 3,405 |  |  | 1,370 |
Self-insurance reserves |  |  | 14,318 |  |  | 10,311 |
Net operating loss and foreign tax credit carryforwards |  |  | 56,287 |  |  | 48,285 |
Financial accruals |  |  | 63,560 |  |  | 52,289 |
Other |  |  | 12,049 |  |  | 8,332 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax assets |  |  | 149,619 |  |  | 120,587 |
Valuation allowance |  |  | 55,758 |  |  | 47,699 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax assets |  |  | 93,861 |  |  | 72,888 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax liabilities |  | $ | 1,277,865 |  | $ | 1,198,740 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of effective income tax rates as compared to the U.S. Federal income tax rate |
|  | Years Ended September 30, |
|  | 2015 |  | 2014 |  | 2013 |
U.S. Federal income tax rate |  |  | 35.0 | % |  | 35.0 | % |  | 35.0 | %
Effect of foreign taxes |  |  | (2.1 | ) |  | 1.2 |  |  | 1.1 |
State income taxes, net of federal tax benefit |  |  | 0.8 |  |  | 1.4 |  |  | 1.5 |
U.S. domestic production activities |  |  | (1.2 | ) |  | (2.6 | ) |  | (2.1 | )
Other impact of foreign operations |  |  | 3.5 |  |  | 0.6 |  |  | (0.5 | )
Other |  |  | 0.6 |  |  | (0.2 | ) |  | 0.3 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate |  |  | 36.6 | % |  | 35.4 | % |  | 35.3 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of reconciliation of the change in the entity's gross unrecognized tax benefits |
|  | September 30, |
|  | 2015 |  | 2014 |
|  | (in thousands) |
Unrecognized tax benefits at October 1, |  | $ | 10,747 |  | $ | 8,129 |
Gross decreases—tax positions in prior periods |  |  | (706 | ) |  | (4 | )
Gross increases—tax positions in prior periods |  |  | 3,278 |  |  | 4,293 |
Gross decreases—current period effect of tax positions |  |  | (821 | ) |  | (836 | )
Gross increases—current period effect of tax positions |  |  | — |  |  | 4 |
Expiration of statute of limitations for assessments |  |  | (956 | ) |  | (533 | )
Settlements |  |  | (331 | ) |  | (306 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrecognized tax benefits at September 30, |  | $ | 11,211 |  | $ | 10,747 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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