| Document and Entity Information | Aug. 05, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | RESMED INC |
| Entity Address, Country | US |
| Amendment Flag | false |
| Entity Central Index Key | 0000943819 |
| Document Type | 8-K |
| Document Period End Date | Aug. 5, 2021 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-15317 |
| Entity Tax Identification Number | 98-0152841 |
| Entity Address, Address Line One | 9001 Spectrum Center Blvd. |
| Entity Address, City or Town | San Diego |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 92123 |
| City Area Code | (858) |
| Local Phone Number | 836-5000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.004 par value |
| Trading Symbol | RMD |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
