Fair Value Measurements (Schedule of Financial Instruments Measure at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Jul. 31, 2021	Jan. 30, 2021	May 02, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market mutual funds	$ 132,514	$ 97,519	$ 69,963
Marketable securities - mutual funds that fund deferred compensation	17,431
Total	149,945
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents - money market mutual funds	132,514	97,519	69,963
Marketable securities - mutual funds that fund deferred compensation	17,431
Total	149,945
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