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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Apr. 01, 2019
Apr. 01, 2018
Apr. 01, 2017
Revenue Recognition            
Sales contract with customer term 1 year          
Advertising Costs            
Advertising costs $ 298,600 $ 278,200 $ 233,700      
Inventories            
Inventory liability 9,600 14,100        
Share-based Compensation Expense            
Cumulative effect adjustment to retained earnings         $ (10,882) $ 57,209
Gross deferred tax assets 298,896 135,309        
Valuation allowance 29,171 28,375        
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]            
Right of use asset 25,557     $ 31,300    
Present value of lease liabilities $ 30,481          
Deferred rent for leases       6,100    
Minimum            
Revenue Recognition            
Post-contract customer support revenue recognition period 1 year          
Required customer payment period 30 days          
Intangible Assets            
Estimated useful life 2 years          
Share-based Compensation Expense            
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          
Share-based Compensation Expense            
Product warranty period 5 years          
Plant and buildings | Maximum            
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 | Minimum            
Share-based Compensation Expense            
Share based compensation expense recognition period 1 year          
Performance-based RSU | Maximum            
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          
Accounting Standards Update 2016-09, Excess Tax Benefit Component            
Share-based Compensation Expense            
Gross deferred tax assets           75,200
Valuation allowance           18,000
Accounting Standards Update 2016-02            
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]            
Present value of lease liabilities       $ 37,400    
Retained earnings            
Share-based Compensation Expense            
Cumulative effect adjustment to retained earnings         $ (10,882) 53,912
Retained earnings | Accounting Standards Update 2016-09, Forfeiture Rate Component            
Share-based Compensation Expense            
Cumulative effect of change on retained earning           3,300
Retained earnings | Accounting Standards Update 2016-09, Excess Tax Benefit Component            
Share-based Compensation Expense            
Cumulative effect adjustment to retained earnings           $ 57,200
Operating Expense            
Advertising Costs            
Advertising costs $ 64,500 $ 58,800 $ 36,700