| Cover | Dec. 16, 2020 | Nov. 30, 2020 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Amendment Flag | false | |
| Document Period End Date | Dec. 16, 2020 | |
| Entity File Number | 001-08359 | |
| Entity Registrant Name | NEW JERSEY RESOURCES CORP | |
| Entity Central Index Key | 0000356309 | |
| Entity Tax Identification Number | 22-2376465 | |
| Entity Incorporation, State or Country Code | NJ | |
| Entity Address, Address Line One | 1415 Wyckoff Road | |
| Entity Address, City or Town | Wall | |
| Entity Address, State or Province | NJ | |
| Entity Address, Postal Zip Code | 07719 | |
| City Area Code | 732 | |
| Local Phone Number | 938-1480 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock - $2.50 par value | |
| Trading Symbol | NJR | |
| Security Exchange Name | NYSE | |
| Entity Emerging Growth Company | false |
