| Document and Entity Information | Jan. 24, 2023 |
| Cover [Abstract] | |
| Entity Registrant Name | NETSCOUT SYSTEMS INC |
| Amendment Flag | false |
| Entity Central Index Key | 0001078075 |
| Document Type | 8-K |
| Document Period End Date | Jan. 24, 2023 |
| Entity Incorporation State 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock |
| Trading Symbol | NTCT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
