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Variable Interest Entities - Unconsolidated VIEs (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Mar. 31, 2019
Variable Interest Entity [Line Items]
Total commitments from the limited partners and general partners to the unconsolidated VIE	$ 18,320,381
Remaining unfunded commitments from the limited partners and general partners to the unconsolidated VIE	6,623,566
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Deferred incentive fee revenue	3,704	$ 3,704
Not Primary Beneficiary
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Investments	116,636	87,001
Fees receivable	1,535	5,896
Due from related parties	1,001	1,332
Total VIE Assets	119,172	94,229
Deferred incentive fee revenue	3,704	3,704
Non-controlling interests	(5,441)	(5,716)
Maximum exposure to loss	$ 117,435	$ 92,217

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- Definition

Variable Interest Entity, Nonconsolidated, Carrying Amount, Due From Related Parties

+ References

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- Definition

Variable Interest Entity, Nonconsolidated, Carrying Amount, Fees Receivable

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- Definition

Variable Interest Entity, Nonconsolidated, Carrying Amount, Investments

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- Definition

Variable Interest Entity, Nonconsolidated, Outstanding Unfunded Commitments

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Variable Interest Entity, Nonconsolidated, Total Commitments

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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- Definition

Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

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