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QUARTERLY RESULTS OF OPERATIONS - UNAUDITED
 12 Months Ended
Mar. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
QUARTERLY RESULTS OF OPERATIONS - UNAUDITED QUARTERLY RESULTS OF OPERATIONS – UNAUDITED
The following table sets forth certain unaudited quarterly results of operations of NetScout for the fiscal years ended March 31, 2020 and 2019. In the opinion of management, this information has been prepared on the same basis as the audited consolidated financial statements and all necessary adjustments, consisting only of normal recurring adjustments, have been included in the amounts stated below to present fairly the quarterly information when read in conjunction with the audited consolidated financial statements and notes thereto included elsewhere in this Annual Report on Form 10-K. The quarterly operating results are not necessarily indicative of future results of operations.
 Three Months Ended
 (in thousands, except per share data)
 March 31, 2020Dec. 31,
2019		Sept. 30,
2019		June 30,
2019		March 31, 2019Dec. 31,
2018		Sept. 30,
2018		June 30,
2018
Revenue$229,351  $260,024  $216,421  $186,024  $235,002  $246,008  $223,797  $205,111  
Gross profit$166,619  $194,439  $157,289  $131,281  $176,466  $176,424  $159,817  $143,084  
Net income (loss)$7,336  $36,725  $(17,472) $(29,343) $19,211  $(3,603) $(26,428) $(62,504) 
Diluted net income (loss) per share$0.10  $0.49  $(0.23) $(0.38) $0.24  $(0.05) $(0.34) $(0.78)