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Commitments (Narrative) (Details)
 12 Months Ended
May 02, 2017
USD ($)
ft²
property
option
Dec. 29, 2017
USD ($)
ft²
debt_instrument
option
Oct. 16, 2017
ft²
Dec. 30, 2016
USD ($)
Operating Leased Assets [Line Items]        
Number of letters of credit entered into (in debt instruments) | debt_instrument   2    
Letters of credit outstanding   $ 0    
Collateral provided for purchasing card program   3,000,000   $ 3,000,000
Building lease [Member]        
Operating Leased Assets [Line Items]        
Line of credit borrowing capacity   500,000.0   500,000.0
Workers Compensation Insurance Policy [Member]        
Operating Leased Assets [Line Items]        
Line of credit borrowing capacity   600,000.0   $ 600,000.0
Building shells [Member] | Operating lease and other financing lease [Member]        
Operating Leased Assets [Line Items]        
Number of properties | property 2      
Standby letters of credit [Member]        
Operating Leased Assets [Line Items]        
Line of credit borrowing capacity   1,000,000    
Alameda, California [Member] | Operating lease and other financing lease [Member]        
Operating Leased Assets [Line Items]        
Area of leased property (in sqft) | ft² 110,783      
Term of lease contract 10 years      
Number of renewal options | option 2      
Renewal option term 5 years      
Number of options to terminate | option 1      
Option for additional area of lease (sq ft) | ft² 170,000      
Alameda, California [Member] | Optional amendment agreement [Member]        
Operating Leased Assets [Line Items]        
Area of leased property (in sqft) | ft² 16,343   19,778  
Term of lease contract 6 months      
Reimbursement cost for contract termination $ 1,500,000      
Accrual for contract termination   1,400,000    
Rent payable   1,200,000    
Capital and operating leases, Minimum lease payments due   $ 28,500,000    
South San Francisco, California [Member] | Leasing Arrangement [Member]        
Operating Leased Assets [Line Items]        
Area of leased property (in sqft) | ft²   116,063    
Number of renewal options | option   2