XML 15 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Document and Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2020
Jul. 31, 2020
Dec. 31, 2019
Cover      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Jun. 30, 2020    
Entity File Number 001-33883    
Entity Registrant Name K12 INC    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-4774688    
Entity Address, Address Line One 2300 Corporate Park Drive    
Entity Address, City or Town Herndon    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 20171    
City Area Code 703    
Local Phone Number 483-7000    
Title of 12(b) Security Common Stock, $0.0001 par value    
Trading Symbol LRN    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   41,309,402  
Entity Public Float     $ 594,180,562
Current Fiscal Year End Date --06-30    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001157408    
Amendment Flag false