XML 95 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - USD ($)
 12 Months Ended
Jun. 30, 2019
Aug. 15, 2019
Dec. 31, 2018
Document and Entity Information      
Entity Registrant Name CARPENTER TECHNOLOGY CORP    
Entity Central Index Key 0000017843    
Current Fiscal Year End Date --06-30    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Jun. 30, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   47,664,249  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 1,687,208,892