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Commitments and Contingencies (Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) ft² renewal_option $ / ft² | Jan. 01, 2021 USD ($) ft² renewal_option | Jun. 01, 2021 USD ($) ft² | Jan. 31, 2021 USD ($) | Jan. 03, 2020 USD ($) | Jan. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Cash paid for amounts included in the measurement of lease liabilities |  | $ 4,600,000 |  |  |  |
Weighted average operating discount rate used to determine the operating lease liability |  | 3.10% |  |  |  |
Weighted average remaining lease term for operating lease |  | 10 years 9 months 18 days |  |  |  |
Future tenant improvement reimbursements |  | $ 1,742,000 |  |  |  |
Other long-term assets |  | 2,800,000 |  |  |  |
Standby Letters of Credit |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Line of credit borrowing capacity |  | 1,600,000 |  |  | $ 1,600,000 |
Letters of credit outstanding |  | $ 0 |  |  |  |
Standby Letters of Credit | Forecast |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Guaranty liabilities |  |  |  | $ 45,900,000 |  |
Headquarters Lease |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Area of leased property (in sqft) | ft² |  | 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
Headquarters Lease | Forecast |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Area of leased property (in sqft) | ft² |  |  | 254,690 |  |  |
Tenant lease improvements allowance |  |  | $ 1,400,000 |  |  |
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 |  |  |  |  |
Build-to-suit lease period | 242 months |  |  |  |  |
Currently estimated amount | $ 700,000 |  |  |  |  |
Annual increase percentage | 3.00% |  |  |  |  |
Payment commencement period | 60 days |  |  |  |  |
Future tenant improvement reimbursements | $ 16,500,000 |  |  |  |  |
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 |  |  |  |  |

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