Equity - Common Stock (Details)	9 Months Ended
	Jun. 30, 2018 vote shares	Sep. 30, 2017 shares
Class of Stock [Line Items]
Shares authorized (in shares)	300,000,000	300,000,000
Number of votes per common share (in vote) | vote	1
Shares issued (in shares)	89,753,662	89,353,641
Shares outstanding (in shares)	89,734,146	89,344,065
Common stock outstanding, unit (in shares)	1
Warrant, unit (in shares)	1
Founders Shares
Class of Stock [Line Items]
Shares issued (in shares)	12,476,250