Earnings Per Share - Antidilutive Securities (Details) - shares shares in Thousands	3 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Restricted Stock
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	493	556
Time Based Restricted Stock Awards
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	195	828
Performance Shares
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	0	628

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration