Acquisitions - Pro Forma Information - Tabular Disclosure (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015
Business Combinations [Abstract]
Revenue	$ 571,369	$ 593,687
Net (loss) income	$ (63,396)	$ 7,000
Basic (loss) income per share (in dollars per share)	$ (0.93)	$ 0.10
Diluted (loss) income per share (in dollars per share)	$ (0.93)	$ 0.10
Basic (in shares)	68,507,000	67,411,000
Diluted (in shares)	68,507,000	68,549,000

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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The weighted average number of shares (units) outstanding in the calculation of pro forma basic earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering.

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