v3.8.0.1
Document and Entity Information - shares
6 Months Ended
Mar. 31, 2018
May 04, 2018
Document Information [Line Items]    
Entity Registrant Name META FINANCIAL GROUP INC  
Entity Central Index Key 0000907471  
Current Fiscal Year End Date --09-30  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2018  
Common Class A [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   9,699,591
Nonvoting Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   0