Noncontrolling Interests Income Attributable to NCI Reconciliation Schedule (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	$ 9,930	$ 18,235	$ 20,286	$ 28,272
Net Income (Loss) Attributable to Noncontrolling Interest	11,960	20,091	24,577	31,979
Royce [Member]
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	$ 2,030	$ 1,856	$ 4,291	$ 3,707