Deferred Commissions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Capitalized contract cost	$ 55,700,000		$ 55,700,000		$ 53,400,000
Capitalized contract cost, amortization	8,100,000	$ 6,100,000	15,700,000	$ 11,800,000
Costs expensed as incurred	2,700,000	1,700,000	4,600,000	3,200,000
Contract asset impairment	$ 0	$ 0	$ 0	$ 0