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Balance Sheet Components - Components of Certain Balance Sheet Asset Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Accounts receivable, net:    
Accounts receivable $ 529,842 $ 395,754
Accounts receivable, net 277,839 185,179
Inventories:    
Raw materials 46,405 30,582
Finished goods 284,017 222,819
Inventory, net 330,422 253,401
Other current assets:    
Value-added tax receivables 23,693 23,132
Prepaid expenses and other assets 24,028 18,600
Other current assets, total 47,721 41,732
Property, plant and equipment, net:    
Property, plant and equipment at cost 359,333 348,760
Less: accumulated depreciation and amortization (271,978) (263,352)
Property, plant and equipment, net 87,355 85,408
Other assets:    
Deferred tax assets 103,071 57,303
Trading investments for deferred compensation plan 17,583 15,043
Investments in privately held companies 11,495 10,776
Other assets 5,995 4,997
Other assets, total 138,144 88,119
Allowance for doubtful accounts    
Accounts receivable, net:    
Valuation allowance for accounts receivable (229) (607)
Allowance for sales returns    
Accounts receivable, net:    
Valuation allowance for accounts receivable (21,712) (18,800)
Allowance for cooperative marketing arrangements    
Accounts receivable, net:    
Valuation allowance for accounts receivable (28,758) (28,022)
Allowance for customer incentive programs    
Accounts receivable, net:    
Valuation allowance for accounts receivable (70,413) (60,857)
Allowance for pricing programs    
Accounts receivable, net:    
Valuation allowance for accounts receivable $ (130,891) $ (102,289)