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Commitments (Narrative) (Details)
 1 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
ft²
renewal_option
$ / ft²
Jan. 03, 2020
USD ($)
ft²
renewal_option
Aug. 30, 2019
ft²
Apr. 30, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 28, 2018
USD ($)
Lessee, Lease, Description [Line Items]            
Weighted average remaining lease term for operating lease   11 years 9 months 18 days        
Future tenant improvement reimbursements   $ 1,742,000        
Cash paid for amounts included in the measurement of lease liabilities   $ 2,900,000        
Weighted average operating discount rate used to determine the operating lease liability   3.90%        
Standby Letters of Credit            
Lessee, Lease, Description [Line Items]            
Line of credit borrowing capacity   $ 1,600,000       $ 1,100,000
Letters of credit outstanding   $ 0        
Headquarters Lease            
Lessee, Lease, Description [Line Items]            
Area of leased property (in sqft) | ft²   221,464 228,941      
Number of options to extend the lease | renewal_option   2        
Renewal term   5 years        
Tenant lease improvements allowance       $ 1,700,000 $ 8,200,000  
Built-To-Suit Lease            
Lessee, Lease, Description [Line Items]            
Area of leased property (in sqft) | ft² 220,000          
Number of options to extend the lease | renewal_option 2          
Renewal term   5 years        
Future tenant improvement reimbursements $ 16,500,000          
Build-to-suit lease period 242 months          
Currently estimated amount $ 700,000          
Annual increase percentage 3.00%          
Payment commencement period 60 days          
Area of property available for lease (in squire feet) | $ / ft² 525          
Percentage of excess costs 50.00%          
Option to terminate lease (after period) 180 months