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Income Taxes Computed at Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes | $ (23,686) | $ (11,952) | $ 70,796 | $ 14,669 | $ (10,457) | $ (22,434) | $ 69,873 | $ 5,583 | $ 49,827 | $ 42,565 | $ 47,067
Provision for income taxes: |  |  |  |  |  |  |  |  |  |  |
Tax at Federal statutory rate |  |  |  |  |  |  |  |  | 17,440 | 14,898 | 16,473
Impact of Partnership income or loss not subject to federal income taxes |  |  |  |  |  |  |  |  | 97 | 697 | 1,631
State taxes net of federal benefit |  |  |  |  |  |  |  |  | 3,192 | 2,801 | 3,493
Permanent differences |  |  |  |  |  |  |  |  | 37 | 28 | 54
Change in valuation allowance |  |  |  |  |  |  |  |  | (658) | (14) | 672
Change in unrecognized tax benefit |  |  |  |  |  |  |  |  | 55 | (1,669) | 189
Other |  |  |  |  |  |  |  |  | (242) | (165) | 211
Income tax expense |  |  |  |  |  |  |  |  | $ 19,921 | $ 16,576 | $ 22,723

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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + 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 Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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