Contract Acquisition Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Capitalized contract cost	$ 61,300,000		$ 61,300,000		$ 60,200,000
Capitalized contract cost, amortization	9,500,000	$ 8,100,000	18,500,000	$ 15,700,000
Costs expensed as incurred	2,800,000	2,700,000	6,200,000	4,600,000
Contract asset impairment	$ 0	$ 0	$ 0	$ 0