Basis of Presentation and Summary of Significant Accounting Policies - General Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 28, 2017 store	Jul. 29, 2016	Jul. 28, 2017 item store	Jul. 29, 2016	Feb. 02, 2018 item	Jan. 27, 2017 item
Nature of Business
Number or stores	390		390
Change in Fiscal Year
Number of quarters in a fiscal year | item			4
Days in each fiscal quarter	91 days	91 days
Number of weeks in period | item			52		53	52
Number of days in a fiscal year			364 days
Number of weeks in a fiscal year every five to six years | item			53
Days in First Half of Fiscal Year			182 days	182 days
Minimum
Change in Fiscal Year
Period during which fiscal years includes 53 weeks			5 years
Maximum
Change in Fiscal Year
Period during which fiscal years includes 53 weeks			6 years
California
Nature of Business
Number or stores	283		283
Texas
Nature of Business
Number or stores	48		48
Arizona
Nature of Business
Number or stores	38		38
Nevada
Nature of Business
Number or stores	21		21