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The Company and Summary of Significant Accounting Policies and Estimates - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2018
Apr. 01, 2018
Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued and other current liabilities $ 434,615 $ 404,577 $ 281,732
Other current assets 70,412 62,557 56,362
Accounts receivable, net $ 459,689 $ 320,653 214,885
Contract with customer term 1 year    
Calculated under Revenue Guidance in Effect before Topic 606      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued and other current liabilities $ 276,777   281,732
Other current assets 61,092   56,362
Accounts receivable, net $ 327,131   214,885
Calculated under Revenue Guidance in Effect before Topic 606 | Sales Returns      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Sales return reserves     31,400
Expected returned inventory     11,400
Expected scrap cost     5,200
Calculated under Revenue Guidance in Effect before Topic 606 | Customer Programs      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accounts receivable, net     76,700
Accounting Standards Update 2014-09 | Sales Returns      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued and other current liabilities     31,400
Other current assets     6,200
Accounting Standards Update 2014-09 | Customer Programs      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued and other current liabilities     $ 76,700