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Employee Stock Plans - Employee Stock Purchase Plan (Details) - 2009 ESPP - shares
3 Months Ended 12 Months Ended
Apr. 23, 2015
Apr. 03, 2016
Jan. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares of common stock reserved for issuance (in shares) 1,000,000.0    
Shares reserved for issuance   3,300,000  
Duration of offering period     6 months
Percentage of employee's total compensation   20.00%  
Maximum number of shares per offering period (in shares)   20,000  
Fair market value of common stock (as a percent)   85.00%