Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information (USD $)
12 Months Ended
Sep. 30, 2012
Nov. 01, 2012
Mar. 31, 2012
Document and Entity Information      
Entity Registrant Name MAXIMUS INC    
Entity Central Index Key 0001032220    
Document Type 10-K    
Document Period End Date Sep. 30, 2012    
Amendment Flag false    
Current Fiscal Year End Date --09-30    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 1,354,461,804
Entity Common Stock, Shares Outstanding   34,088,737  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY