Fair Value Measurements (Schedule of Financial Instruments Measure at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Oct. 30, 2021	Jan. 30, 2021	Oct. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market mutual funds	$ 165,072	$ 97,519	$ 48,883
Marketable securities - mutual funds that fund deferred compensation	17,834
Total	182,906
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market mutual funds	165,072	97,519	48,883
Marketable securities - mutual funds that fund deferred compensation	17,834
Total	182,906
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market mutual funds	0	0	0
Marketable securities - mutual funds that fund deferred compensation	0
Total	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market mutual funds	0	$ 0	$ 0
Marketable securities - mutual funds that fund deferred compensation	0
Total	$ 0