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Employee Stock Plans - 2009 Stock Plan - Additional Information (Details)
shares in Thousands
Apr. 24, 2019
shares
2009 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Remaining balance of available shares cancelled 299,070
2019 Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Extended term under stock plan 10 years