Contract Acquisition Costs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Capitalized contract cost	$ 55,100,000		$ 55,100,000		$ 53,400,000
Capitalized contract cost, amortization	8,300,000	$ 6,700,000	24,000,000.0	$ 18,500,000
Costs expensed as incurred	3,600,000	2,300,000	8,200,000	5,500,000
Contract asset impairment	$ 0	$ 0	$ 0	$ 0