Noncontrolling Interests Income Attributable to NCI Reconciliation Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ 8,973	$ 5,547	$ 22,329	$ 15,608
Net Income (Loss) Attributable to Noncontrolling Interest	9,448	8,270	25,667	20,545
Royce [Member]
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	$ 475	$ 2,723	$ 3,338	$ 4,937