| Document and Entity Information | Oct. 29, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 29, 2020 |
| Entity Registrant Name | NETSCOUT SYSTEMS, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 000-26251 |
| Entity Tax Identification Number | 04-2837575 |
| Entity Address, Address Line One | 310 Littleton Road |
| Entity Address, City or Town | Westford |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01886 |
| City Area Code | 978 |
| Local Phone Number | 614-4000 |
| Entity Information, Former Legal or Registered Name | Not Applicable |
| 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 | 0001078075 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | NTCT |
| Security Exchange Name | NASDAQ |
