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Balance Sheet Components - Components of Certain Balance Sheet Asset Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Mar. 31, 2020
Accounts receivable, net:    
Accounts receivable $ 973,523 $ 597,939
Accounts receivable, net 750,749 394,743
Inventories:    
Raw materials 60,606 56,052
Finished goods 334,102 173,197
Inventory, net 394,708 229,249
Other current assets:    
Value-added tax receivables 41,862 33,616
Prepaid expenses and other assets 52,891 41,304
Other current assets, total 94,753 74,920
Property, plant and equipment, net:    
Property, plant and equipment at cost 378,392 346,506
Accumulated depreciation and amortization (292,006) (270,387)
Property, plant and equipment, net 86,386 76,119
Other assets:    
Deferred tax assets 222,763 240,528
Right-of-use assets 31,386 25,557
Trading investments for deferred compensation plan 24,559 20,085
Investments in privately held companies 46,942 45,949
Other assets 13,747 12,900
Other assets, total $ 339,397 345,019
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent  
Allowance for doubtful accounts    
Accounts receivable, net:    
Valuation allowance for accounts receivable $ (1,358) (1,894)
Allowance for sales returns    
Accounts receivable, net:    
Valuation allowance for accounts receivable (10,487) (6,599)
Allowance for cooperative marketing arrangements    
Accounts receivable, net:    
Valuation allowance for accounts receivable (40,396) (38,794)
Allowance for customer incentive programs    
Accounts receivable, net:    
Valuation allowance for accounts receivable (63,051) (55,741)
Allowance for pricing programs    
Accounts receivable, net:    
Valuation allowance for accounts receivable $ (107,482) $ (100,168)