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Quarterly Results of Operations - Schedule of Quarterly Financial Information (Details) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | 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, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment | $ 6,200 | $ 1,400 |  |  |  |  |  |  | $ 347 |  |  | $ 1,400 | $ 7,639 | $ 3,492 | $ 1,705
Income tax expense |  | $ 1,300 |  |  |  |  |  |  |  |  |  |  | $ 6,359 | 2,373 | 5,111
Effective income tax expense rate | 99.60% | 32.90% | 33.70% | 33.30% | (109.00%) | 43.00% | 5.20% | 35.90% | 11.90% | 35.50% | 28.90% | 36.10% |  |  |
Settlement of lawsuits |  |  |  |  | $ 1,100 |  |  | $ 540 | $ 1,100 | $ 8,200 | $ 10,300 |  |  | $ 1,900 | $ 11,700

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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