Marketable Securities - Investments in Marketable Securities (Details) - USD ($)	Apr. 30, 2022	Jan. 29, 2022	May 01, 2021
Financial Instruments And Marketable Securities [Line Items]
Cost or Amortized Cost	$ 50,997,000	$ 97,029,000	$ 76,602,000
Gross Unrealized Holding Gains	19,000	9,000	32,000
Gross Unrealized Holding Losses	(19,000)	(11,000)	(1,000)
Estimated Fair Value	50,997,000	97,027,000	76,633,000
Commercial paper
Financial Instruments And Marketable Securities [Line Items]
Cost or Amortized Cost	39,921,000	64,235,000	69,938,000
Gross Unrealized Holding Gains	19,000	9,000	32,000
Gross Unrealized Holding Losses	(19,000)	(11,000)	(1,000)
Estimated Fair Value	39,921,000	64,233,000	69,969,000
Fixed income securities
Financial Instruments And Marketable Securities [Line Items]
Cost or Amortized Cost	11,076,000	32,794,000	6,664,000
Gross Unrealized Holding Gains	0	0	0
Gross Unrealized Holding Losses	0	0	0
Estimated Fair Value	$ 11,076,000	$ 32,794,000	$ 6,664,000