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Income Taxes Computed at Federal Statutory Rate (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations before taxes | $ (31,923) | $ (4,993) | $ 94,113 | $ 21,475 | $ (72,428) | $ (13,970) | $ 129,876 | $ 26,913 | $ 78,672 | $ 70,391 | $ 61,399
Provision for income taxes: |  |  |  |  |  |  |  |  |  |  |
Tax at Federal statutory rate |  |  |  |  |  |  |  |  | 27,535 | 24,637 | 21,490
Impact of Partnership loss not subject to federal income taxes |  |  |  |  |  |  |  |  | 477 | 3,228 | 628
State taxes net of federal benefit |  |  |  |  |  |  |  |  | 5,672 | 4,922 | 3,310
Permanent differences |  |  |  |  |  |  |  |  | 80 | 78 | 57
Deferred tax benefit |  |  |  |  |  |  |  |  |  | (3,179) |
Change in valuation allowance |  |  |  |  |  |  |  |  | 26 | 3,027 |
Change in unrecognized tax benefit |  |  |  |  |  |  |  |  |  | 81 | (113)
Other |  |  |  |  |  |  |  |  | (52) | 41 | (57)
Income tax expense |  |  |  |  |  |  |  |  | $ 33,738 | $ 32,835 | $ 25,315

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + 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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