| Document and Entity Information | Jul. 07, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 7, 2021 |
| Entity File Number | 0-8814 |
| Entity Registrant Name | PURE CYCLE CORPORATION |
| Entity Incorporation, State or Country Code | CO |
| Entity Tax Identification Number | 84-0705083 |
| Entity Address State Or Province | CO |
| Entity Address, Address Line One | 34501 East Quincy Avenue, Building 34, Box 10 |
| Entity Address, City or Town | Watkins |
| Entity Address, Postal Zip Code | 80137 |
| City Area Code | 303 |
| Local Phone Number | 292-3456 |
| Title of 12(b) Security | Common Stock 1/3 of $.01 par value |
| Trading Symbol | PCYO |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000276720 |
| Amendment Flag | false |
