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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 489,112 $ 456,888  
Less: Accumulated depreciation and amortization (293,926) (254,659)  
Property and equipment, net 195,186 202,229  
Depreciation and amortization expense related to property and equipment 71,200 69,500 $ 65,000
Reduction to gross cost and accumulated depreciation for zero net book value assets 24,700 55,000  
Furniture and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 119,316 117,250  
Computer equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 111,538 104,296  
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 258,258 $ 235,342