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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 |  |

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