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Equity Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended					12 Months Ended
	Sep. 30, 2019 USD ($) shares	Mar. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2017 class	Mar. 31, 2020 USD ($) vote $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares
Class of Stock [Line Items]
Number of common stock classes outstanding | class					2
Distributions in excess of required tax distributions to members | $						$ 47,368	$ 50,649	$ 36,943
Proceeds from offering | $						147,122	193,504	125,200
Excess Distribution of Required Tax Distributions
Class of Stock [Line Items]
Distributions in excess of required tax distributions to members | $						$ 34,014	$ 30,698	$ 27,631
Common Class A
Class of Stock [Line Items]
Number of votes per share of common stock | vote						1
Shares issued in connection with offering (in shares)						2,451,633	4,141,921	3,834,686
Common Class B
Class of Stock [Line Items]
Number of votes per share of common stock | vote						10
September 2019 Offering | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)	2,680,089
Shares issued in connection with registered offering (in USD per share) | $ / shares						$ 60.01
Proceeds from offering | $	$ 147,122
September 2019 Offering, Current Stockholder Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)	228,456
September 2019 Offering, New Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)	2,451,633
March 2019 Offering | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)		1,449,303
Shares issued in connection with registered offering (in USD per share) | $ / shares		$ 45.65					$ 45.65
Proceeds from offering | $		$ 63,878
March 2019 Offering, Current Stockholder Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)		50,000
March 2019 Offering, New Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)		1,399,303
September 2018 Offering | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)			2,880,979
Shares issued in connection with registered offering (in USD per share) | $ / shares			$ 47.26
Proceeds from offering | $			$ 129,626
September 2018 Offering, Current Stockholder Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)			138,361
September 2018 Offering, New Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)			2,742,618
March 2018 Offering | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)				4,531,001
Shares issued in connection with registered offering (in USD per share) | $ / shares				$ 34.25				$ 34.25
Proceeds from offering | $				$ 125,200
March 2018 Offering, Current Stockholder Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)				696,315
March 2018 Offering, New Issuance | Common Class A
Class of Stock [Line Items]
Shares issued in connection with offering (in shares)				3,834,686
Member Units [Member] | Common Class B
Class of Stock [Line Items]
Purchase of interest by parent (in shares)	1,466,712	711,943	1,372,674	2,235,187
Member Units [Member] | Common Class C
Class of Stock [Line Items]
Purchase of interest by parent (in shares)	984,921	687,360	1,369,944	1,599,499

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