Equity - Class A Convertible Preferred Units (Details) - USD ($)										12 Months Ended
	May 11, 2019	May 10, 2019	Apr. 05, 2019	Feb. 14, 2019	Nov. 14, 2018	Aug. 14, 2018	May 15, 2018	Apr. 26, 2018	Apr. 21, 2016	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2017	Jun. 24, 2016	Jun. 23, 2016
Preferred Units
Accretion of beneficial conversion feature											$ 36,517,000	$ 67,239,000
Repurchase of warrants										$ 0	$ 0	$ 14,988,000
Class A Convertible Preferred Units
Preferred Units
Temporary equity, issued (in units)											19,942,169
Oaktree Capital Management L.P.
Preferred Units
Preferred units, authorized amount									$ 200,000,000						$ 240,000,000
Oaktree Capital Management L.P. | Warrant
Preferred Units
Warrants outstanding (in units)													4,375,112
Class of warrant or right, exercise price														$ 0.01
Warrants exercised and converted to common units (in units)			1,458,371									228,797
Proceeds from warrant exercises			$ 100,000									$ 100,000
Repurchase of warrants (in units)								1,229,575
Repurchase of warrants								$ 15,000,000.0
Oaktree Capital Management L.P. | Class A Convertible Preferred Units
Preferred Units
Preferred units dividend rate									10.75%
Proceeds from sale of convertible preferred units and warrants, net of offering costs									$ 235,000,000.0
Offering costs									$ 5,000,000.0
Days after quarter end distribution paid									45 days
Accretion of beneficial conversion feature											$ 36,500,000	$ 67,200,000
Preferred units redeemed	12,473,191		7,468,978
Preferrred unit redemption price per unit excluding unpaid dividends	$ 13.2385		$ 13.389
Preferred stock redemption premium percentage	110.00%		111.25%
Initial conversion price (in dollars per unit)									$ 12.035
Preferred units accrued but unpaid distributions	$ 0.1437		$ 0.338
Preferred unit redemption price per unit	$ 13.3822		$ 13.727
Preferred unit redemption amount	$ 166,900,000		$ 102,500,000
Amount paid to preferred unitholders		$ 4,034,000		$ 6,449,000	$ 6,449,000	$ 6,449,000	$ 6,449,000
Distributions made to preferred unitholders distributions declared per unit		$ 0.3234