The Company and its Significant Accounting Policies - Share-Based Compensation (Details)	12 Months Ended
	Jan. 28, 2017 group
Employee group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of groups used in calculating assumptions for stock option exercises and pre-vesting terminations of stock options	2
Employee/non-employee group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of groups used in calculating assumptions for stock option exercises and pre-vesting terminations of stock options	1
Stock Purchase Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period	2 years