v3.26.1
SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2024
Property and Equipment      
Benefit to net income from change in accounting estimate $ 180    
Per share impact of change in accounting estimate, basic $ 0.8    
Per share impact of change in accounting estimate, diluted $ 0.77    
Buildings | Minimum      
Property and Equipment      
Estimated useful lives (in years)   30 years  
Buildings | Maximum      
Property and Equipment      
Estimated useful lives (in years)   50 years  
Land improvements      
Property and Equipment      
Estimated useful lives (in years)   20 years  
Leasehold improvements | Maximum      
Property and Equipment      
Estimated useful lives (in years)   10 years  
Office and other equipment | Minimum      
Property and Equipment      
Estimated useful lives (in years)   2 years  
Office and other equipment | Maximum      
Property and Equipment      
Estimated useful lives (in years)   20 years  
Information technology equipment      
Property and Equipment      
Estimated useful lives (in years)   6 years 5 years
Information technology equipment (acquired as used) | Minimum      
Property and Equipment      
Estimated useful lives (in years) 1 year 6 months 3 years  
Information technology equipment (acquired as used) | Maximum      
Property and Equipment      
Estimated useful lives (in years) 3 years 4 years  
Information technology equipment (acquired as new)      
Property and Equipment      
Estimated useful lives (in years)   6 years 5 years