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EMPLOYEE STOCK PLANS - Employee Stock Purchase Plan (Details) - 2009 ESPP - shares
12 Months Ended
Apr. 26, 2017
Apr. 23, 2015
Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares of common stock reserved for issuance (in shares) 1,500,000 1,000,000  
Shares reserved for issuance (in shares)     4,800,000
Duration of offering period     6 months
Percentage of employee's total compensation     20.00%
Maximum shares per offering period     20,000
Percentage of fair market value of common stock     85.00%