Document And Entity Information - shares
9 Months Ended
Nov. 03, 2018
Nov. 21, 2018
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Nov. 03, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Entity Registrant Name ROSS STORES INC  
Entity Central Index Key 0000745732  
Current Fiscal Year End Date --02-02  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding (in shares)   370,588,820
Entity Small Business false  
Entity Emerging Growth Company false