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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
12 Months Ended
Mar. 31, 2022
USD ($)
Reporting_Unit
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Revenue Recognition      
Sales contract with customer term 1 year    
Advertising Costs      
Advertising costs $ 628.9 $ 450.0 $ 298.6
Inventories      
Inventory liability $ 46.4 $ 11.8  
Leases      
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets Other assets  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued and other current liabilities Accrued and other current liabilities  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent  
Impairment of Goodwill      
Number of reporting units | Reporting_Unit 1    
Minimum      
Revenue Recognition      
Post-contract customer support revenue recognition period 1 year    
Required customer payment period 30 days    
Intangible Assets      
Estimated useful life 1 year    
Product Warranties      
Product warranty period 1 year    
Maximum      
Revenue Recognition      
Post-contract customer support revenue recognition period 2 years    
Required customer payment period 60 days    
Intangible Assets      
Estimated useful life 10 years    
Product Warranties      
Product warranty period 3 years    
Plant and buildings      
Property, Plant and Equipment      
Estimated useful life 25 years    
Equipment | Minimum      
Property, Plant and Equipment      
Estimated useful life 3 years    
Equipment | Maximum      
Property, Plant and Equipment      
Estimated useful life 5 years    
Internal-use software | Minimum      
Property, Plant and Equipment      
Estimated useful life 3 years    
Internal-use software | Maximum      
Property, Plant and Equipment      
Estimated useful life 10 years    
Tooling | Minimum      
Property, Plant and Equipment      
Estimated useful life 6 months    
Tooling | Maximum      
Property, Plant and Equipment      
Estimated useful life 1 year    
Leasehold Improvements | Maximum      
Property, Plant and Equipment      
Estimated useful life 10 years    
Performance-based RSU      
Share-based Compensation Expense      
Share based compensation expense recognition period 3 years    
Market Based RSUs | 2006 Plan      
Share-based Compensation Expense      
Vesting period 3 years    
Operating Expense      
Advertising Costs      
Advertising costs $ 267.8 $ 168.2 $ 64.5