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Stock-Based Awards - Narratives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 26, 2019	Oct. 27, 2018	Oct. 26, 2019	Oct. 27, 2018	Jan. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net tax (deficiency) benefit	$ (0.2)	$ 0.1	$ (0.8)	$ 0.7
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 2.3		2.3
Total compensation cost not yet recognized, period for recognition	2 years 3 months 18 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 10.1		$ 10.1
Total compensation cost not yet recognized, period for recognition	2 years 6 months
Granted (in shares)			115,973
Shares outstanding	207,473		207,473		126,470
Shares canceled (in shares)			586
Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to stock options	$ 10.6		$ 10.6
Total compensation cost not yet recognized, period for recognition	1 year 9 months 18 days
Compensation expense	$ 27.9		$ 27.9
RSUs outstanding (in shares)			333,567
Granted (in shares)			475,629
Shares outstanding	667,583		667,583		377,354
Shares canceled (in shares)			128,669
Target Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding	474,508		474,508
Supplemental Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			142,062
Shares outstanding	193,075		193,075

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