| Cover - USD ($) | 12 Months Ended | ||
| Mar. 31, 2020 | Jul. 15, 2020 | Sep. 30, 2019 | |
| Cover [Abstract] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | false | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Document Period End Date | Mar. 31, 2020 | ||
| Document Fiscal Period Focus | FY | ||
| Document Fiscal Year Focus | 2020 | ||
| Current Fiscal Year End Date | --03-31 | ||
| Entity File Number | 001-33625 | ||
| Entity Registrant Name | VIRTUSA CORPORATION | ||
| Entity Central Index Key | 0001207074 | ||
| Entity Tax Identification Number | 04-3512883 | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Address, Address Line One | 132 Turnpike Rd | ||
| Entity Address, City or Town | Southborough | ||
| Entity Address, State or Province | MA | ||
| Entity Address, Postal Zip Code | 01772 | ||
| City Area Code | 508 | ||
| Local Phone Number | 389-7300 | ||
| Title of 12(b) Security | Common Stock | ||
| Trading Symbol | VRTU | ||
| Security Exchange Name | NASDAQ | ||
| 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 | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 914,194,732 | ||
| Entity Common Stock, Shares Outstanding | 30,246,972 |
