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Current and Deferred Income Tax (Benefit) and Expenses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Deferred Income Tax Assets And Liabilities |  |  |  |
Income (loss) before income taxes | $ (11,421) | $ (21,766) | $ 100,032 | $ 76,368
Current tax (benefit) expense | (5,803) | (5,764) | (6,564) | 27,270
Deferred tax expense (benefit) | 2,354 | (2,670) | 40,844 | 4,451
Deferred tax expense (benefit) - impact of tax reform | 33 |  | (11,203) |
Total deferred tax expense (benefit) | 2,387 | (2,670) | 29,641 | 4,451
Total tax expense (benefit) | $ (3,416) | $ (8,434) | $ 23,077 | $ 31,721

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) 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 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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