v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Oct. 31, 2018
Nov. 30, 2018
Document and Entity Information [Abstract]    
Entity Registrant Name HEALTHEQUITY INC  
Entity Central Index Key 0001428336  
Current Fiscal Year End Date --01-31  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Document Type 10-Q  
Document Period End Date Oct. 31, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   62,388,638