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Balance Sheet Components - Components of Certain Balance Sheet Asset Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Apr. 01, 2019
Mar. 31, 2019
Accounts receivable, net:      
Accounts receivable $ 656,854   $ 573,348
Accounts receivable, net 465,969   383,309
Inventories:      
Raw materials 33,154   40,970
Finished goods 305,160   252,525
Inventory, net 338,314   293,495
Other current assets:      
Value-added tax receivables 36,146   34,321
Prepaid expenses and other assets 43,484   34,795
Other current assets, total 79,630   69,116
Property, plant and equipment, net:      
Property, plant and equipment at cost 366,540   359,345
Accumulated depreciation and amortization (290,972)   (280,793)
Property, plant and equipment, net 75,568   78,552
Other assets:      
Deferred tax assets 98,019   90,808
Right-of-use assets 30,149 $ 31,300  
Trading investments for deferred compensation plan 22,862   20,363
Investments in privately held companies 16,674   16,022
Other assets 5,721   5,260
Other assets, total 173,425   132,453
Allowance for doubtful accounts      
Accounts receivable, net:      
Valuation allowance for accounts receivable (1,391)   (84)
Allowance for sales returns      
Accounts receivable, net:      
Valuation allowance for accounts receivable (6,525)   (6,486)
Allowance for cooperative marketing arrangements      
Accounts receivable, net:      
Valuation allowance for accounts receivable (37,109)   (35,080)
Allowance for customer incentive programs      
Accounts receivable, net:      
Valuation allowance for accounts receivable (60,619)   (60,036)
Allowance for pricing programs      
Accounts receivable, net:      
Valuation allowance for accounts receivable $ (85,241)   $ (88,353)