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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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