Description of the Company and Basis of Presentation (Details) $ / shares in Units, shares in Thousands, $ in Thousands								3 Months Ended	9 Months Ended
	Mar. 10, 2020 shares	Oct. 29, 2018 segment	Mar. 21, 2018 shares	Mar. 19, 2018 shares	Nov. 07, 2017 shares	Nov. 06, 2017 $ / shares shares	Jan. 16, 2014 USD ($)	Jun. 30, 2020 segment $ / shares	Jun. 30, 2020 segment $ / shares	Jun. 30, 2018 USD ($)	Sep. 30, 2019 $ / shares
Subsidiary, Sale of Stock [Line Items]
Common stock, par value (in USD per share) | $ / shares								$ 0.01	$ 0.01		$ 0.01
Repayments of debt | $										$ 104,936
Number of reportable segments | segment		3						2	2
IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)						27,777
Common stock, par value (in USD per share) | $ / shares						$ 0.01
Proceeds from issuance of common stock | $										$ 137,605
Initial Public Offering - Shares from Existing Shareholders
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)			2,625	17,500		8,333
Initial Public Offering - Shares from The Company
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)						19,444
Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)					4,167
Additional Secondary Public Offering [Member]
Subsidiary, Sale of Stock [Line Items]
Number of shares issued in transaction (in shares)	13,000
EWT Holdings II Corp and EWT Holdings III Corp
Subsidiary, Sale of Stock [Line Items]
Stock purchase price, net of cash received | $							$ 730,577