v3.8.0.1
Document and Entity Information - shares
9 Months Ended
Oct. 31, 2017
Nov. 30, 2017
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  
Document Type 10-Q  
Document Period End Date Oct. 31, 2017  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   60,672,608