Property and Equipment - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 228,191	$ 209,888
Less: accumulated depreciation and amortization	(129,473)	(109,594)
Total property and equipment, net	98,718	100,294
Computers, software, and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	13,904	13,249
Site operation equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	106,120	102,316
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	5,433	4,802
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	45,297	39,081
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 57,437	$ 50,440