| Document and Entity Information - USD ($) | 12 Months Ended | ||
| Mar. 31, 2021 | Sep. 30, 2021 | May 24, 2021 | |
| Cover [Abstract] | |||
| Entity Registrant Name | NEXTGEN HEALTHCARE, INC. | ||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | This Amendment No. 1 on Form 10-K/A (this “Form 10-K/A”) to the Annual Report on Form 10-K of NextGen Healthcare, Inc. for the fiscal year ended March 31, 2021, filed with the Securities and Exchange Commission (the “SEC”) on May 26, 2021 (the “Original 10-K”) is being filed solely for the purpose of including the information required by Part III on Form 10-K. This information was previously omitted from the Original 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information in the above referenced items to be incorporated in the Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are filing this Amendment No. 1 to include Part III information in our Form 10-K because we will not file a definitive proxy statement containing such information within 120 days after the end of the fiscal year covered by the Original 10-K. In addition, this Form 10-K/A deletes the reference on the cover of the Original 10-K to the incorporation by reference of portions of our proxy statement into Part III of the Original 10-K. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), this Form 10-K/A also contains certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. Because no financial statements have been included in this Form 10-K/A and this Form 10-K/A does not contain or amend any disclosure with respect to Items 307 and 30 of Regulation S-K, paragraphs 3,4, and 5 of the certifications have been omitted. Except as described above, this Form 10-K/A does not modify or update disclosure in the Original 10-K. Furthermore, this Form 10-K/A does not change any previously reported financial results. Information not affected by this Form 10-K/A remains unchanged and reflects the disclosures made at the time the Original 10-K was filed. | ||
| Document Period End Date | Mar. 31, 2021 | ||
| Document Fiscal Year Focus | 2021 | ||
| Document Fiscal Period Focus | FY | ||
| Current Fiscal Year End Date | --03-31 | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Public Float | $ 704,935,000 | ||
| Entity Voluntary Filers | No | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Current Reporting Status | Yes | ||
| Entity Small Business | false | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Shell Company | false | ||
| Entity Common Stock, Shares Outstanding | 67,031,182 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Entity Central Index Key | 0000708818 | ||
| Entity Emerging Growth Company | false | ||
| Entity File Number | 001-12537 | ||
| Entity Incorporation, State or Country Code | CA | ||
| Entity Tax Identification Number | 95-2888568 | ||
| Entity Address, Address Line One | 3525 Piedmont Rd., NE | ||
| Entity Address, Address Line Two | Building 6, Suite 700 | ||
| Entity Address, City or Town | Atlanta | ||
| Entity Address, State or Province | GA | ||
| Entity Address, Postal Zip Code | 30305 | ||
| City Area Code | (404) | ||
| Local Phone Number | 467-1500 | ||
| Title of 12(b) Security | Common Stock, $0.01 Par Value | ||
| Security Exchange Name | NASDAQ | ||
| Trading Symbol | NXGN | ||
| Entity Interactive Data Current | Yes |
