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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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