Income Per Share - Schedule of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	May 01, 2021	Jan. 30, 2021	Oct. 31, 2020	Aug. 01, 2020	May 02, 2020	Feb. 01, 2020	Oct. 26, 2019	Jul. 27, 2019	May 01, 2021	May 02, 2020	Apr. 27, 2019
Earnings Per Share [Abstract]
Net income	$ 31.1	$ 31.9	$ 38.6	$ 20.7	$ 30.1	$ 41.2	$ 23.8	$ 28.3	$ 122.3	$ 123.4	$ 91.6
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Denominator for basic income per share - weighted average shares outstanding and vested/unissued RSUs									38,038,615	37,574,671	37,405,298
Dilutive potential common shares - stock options, RSAs and RSUs (in shares)									267,671	269,799	264,262
Denominator for diluted income per share									38,306,286	37,844,470	37,669,560
Basic and diluted income per share:
Basic income per share (in dollars per share)	$ 0.82	$ 0.84	$ 1.01	$ 0.55	$ 0.80	$ 1.10	$ 0.63	$ 0.75	$ 3.22	$ 3.28	$ 2.45
Diluted income per share (in dollars per share)	$ 0.81	$ 0.83	$ 1.01	$ 0.54	$ 0.79	$ 1.09	$ 0.63	$ 0.75	$ 3.19	$ 3.26	$ 2.43
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding									738,167	566,620	678,321