v3.19.2
Cover Page - shares
6 Months Ended
Jun. 30, 2019
Jul. 22, 2019
Cover page.    
Amendment Flag false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0000040888  
Current Fiscal Year End Date --12-31  
Entity Address, Address Line One 222 N. Pacific Coast Highway  
Entity Address, Address Line Two Suite 500  
Entity Address, City or Town El Segundo  
Entity Address, State or Province CA  
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2019  
Entity File Number 1-01520  
Entity Registrant Name Aerojet Rocketdyne Holdings, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 34-0244000  
Entity Address, Postal Zip Code 90245  
City Area Code 310  
Local Phone Number 252-8100  
Title of 12(b) Security Common stock, $0.10 par value  
Trading Symbol AJRD  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   78,676,102