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Balance Sheet Components - Components of Certain Balance Sheet Asset Amounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Accounts receivable, net:    
Accounts receivable $ 1,196,050 $ 597,939
Accounts receivable, net 894,937 394,743
Inventories:    
Raw materials 94,748 56,052
Finished goods 382,054 173,197
Inventory, net 476,802 229,249
Other current assets:    
Value-added tax receivables 60,746 33,616
Prepaid expenses and other assets 56,995 41,304
Other current assets, total 117,741 74,920
Property, plant and equipment, net:    
Property, plant and equipment at cost 392,478 346,506
Accumulated depreciation and amortization (295,795) (270,387)
Property, plant and equipment, net 96,683 76,119
Other assets:    
Deferred tax assets 219,145 240,528
Right-of-use assets 31,532 25,557
Trading investments for deferred compensation plan 24,056 20,085
Investments in privately held companies 44,634 45,949
Other assets 14,366 12,900
Other assets, total $ 333,733 345,019
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 $ (1,328) (1,894)
Allowance for sales returns    
Accounts receivable, net:    
Valuation allowance for accounts receivable (14,665) (6,599)
Allowance for cooperative marketing arrangements    
Accounts receivable, net:    
Valuation allowance for accounts receivable (53,387) (38,794)
Allowance for customer incentive programs    
Accounts receivable, net:    
Valuation allowance for accounts receivable (91,863) (55,741)
Allowance for pricing programs    
Accounts receivable, net:    
Valuation allowance for accounts receivable $ (139,870) $ (100,168)