Cover Page - shares	6 Months Ended
	Sep. 30, 2019	Oct. 24, 2019
Cover page.
Entity File Number	000-26251
Entity Address, Address Line One	310 Littleton Road
Entity Shell Company	false
Entity Current Reporting Status	Yes
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, $0.001 par value per share
Entity Incorporation, State or Country Code	DE
Document Transition Report	false
Document Quarterly Report	true
Entity Registrant Name	NETSCOUT SYSTEMS, INC.
Entity Central Index Key	0001078075
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Trading Symbol	NTCT
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		74,838,047
Entity Tax Identification Number	04-2837575
Entity Interactive Data Current	Yes
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