| Cover - USD ($) $ in Billions | 12 Months Ended | ||
| Dec. 31, 2022 | Feb. 09, 2023 | Jun. 30, 2022 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Document Annual Report | true | ||
| Document Period End Date | Dec. 31, 2022 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Transition Report | false | ||
| 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, 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 | ||
| 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 Well Known Seasoned Issuer | Yes | ||
| 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 | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 3.3 | ||
| Entity Common Stock, Shares Outstanding | 80,677,246 | ||
| Documents Incorporated by Reference | None. | ||
| Amendment Flag | false | ||
| Document Fiscal Year Focus | 2022 | ||
| Document Fiscal Period Focus | FY | ||
| Entity Central Index Key | 0000040888 |
| Audit Information | 12 Months Ended |
| Dec. 31, 2022 | |
| Audit Information [Abstract] | |
| Auditor Name | PricewaterhouseCoopers LLP |
| Auditor Firm ID | 238 |
| Auditor Location | Sacramento, California |
