Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Proceeds from offering		$ 147,122	$ 129,626
Common Class A
Class of Stock [Line Items]
Stock sold in connection with secondary public offering (in shares)		2,451,633
September 2019 Offering | Common Class A
Class of Stock [Line Items]
Stock sold in connection with secondary public offering (in shares)	2,680,089
Shares sold in connection with secondary offering (in dollars per share)	$ 60.01	$ 60.01
Proceeds from offering	$ 147,122
September 2019 Offering, Current Stockholder Issuance | Common Class A
Class of Stock [Line Items]
Stock sold in connection with secondary public offering (in shares)	228,456
September 2019 Offering, New Issuance | Common Class A
Class of Stock [Line Items]
Stock sold in connection with secondary public offering (in shares)	2,451,633
Members’ Equity (Deficit) | Common Class B
Class of Stock [Line Items]
Purchase of interest by parent (in shares)	1,466,712
Members’ Equity (Deficit) | Common Class C
Class of Stock [Line Items]
Purchase of interest by parent (in shares)	984,921