Carrying value of Other Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 122,433	$ 13,814	$ 80,779	$ 12,649
Additions	5,000	8,511	7,000	9,676
Change in fair value, net	(45,597)		(5,943)
Ending balance	$ 81,836	$ 22,325	$ 81,836	$ 22,325