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Leases - Narrative (Details)
 6 Months Ended
Apr. 01, 2019
USD ($)
ft²
Jun. 28, 2019
USD ($)
ft²
Jan. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]      
Cash paid for amounts included in the measurement of lease liabilities   $ 1,400,000  
Weighted average remaining lease term for operating lease   8 years 7 months 6 days  
Weighted average operating discount rate used to determine the operating lease liability   4.20%  
Tenant improvement allowance   $ 1,161,000  
Aggregate contractual base rent   $ 31,450,000  
Alameda, California      
Lessee, Lease, Description [Line Items]      
Area of lease property (in square feet) | ft²   169,606  
Tenant improvement reimbursements     $ 8,200,000
Operating lease, expansion (in square feet) | ft² 37,544    
Operating lease, surrendered (in square feet) | ft² 2,703    
Tenant improvement allowance $ 1,700,000    
Minimum | Alameda, California      
Lessee, Lease, Description [Line Items]      
Monthly base rent 224,505    
Operating lease, not yet commenced, monthly base rent 71,334    
Maximum | Alameda, California      
Lessee, Lease, Description [Line Items]      
Monthly base rent 283,933    
Operating lease, not yet commenced, monthly base rent $ 90,481