Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 61,192us-gaap_NetIncomeLoss	$ 49,106us-gaap_NetIncomeLoss	$ 40,609us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	19,709	18,260	17,464
Loss on disposal of fixed assets	300	39	104
Deal related compensation expense and accretion charges	153	151	263
Share-based compensation expense associated with equity awards	16,580us-gaap_ShareBasedCompensation	12,930us-gaap_ShareBasedCompensation	9,591us-gaap_ShareBasedCompensation
Net change in fair value of contingent and contractual liabilities	(10)	(303)	466
Deferred income taxes	2,736us-gaap_DeferredIncomeTaxExpenseBenefit	5,214us-gaap_DeferredIncomeTaxExpenseBenefit	3,909us-gaap_DeferredIncomeTaxExpenseBenefit
Other gains	168us-gaap_OtherNoncashIncomeExpense	(86)us-gaap_OtherNoncashIncomeExpense	(3)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities
Accounts receivable	(21,801)	13,451	82
Inventories	(499)us-gaap_IncreaseDecreaseInInventories	(6,798)us-gaap_IncreaseDecreaseInInventories	1,433us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(2,169)	(2,841)	5,391
Accounts payable	1,355	1,498	(2,345)
Accrued compensation and other expenses	13,233	6,734	10,739
Income taxes payable	(684)	677	114
Deferred revenue	16,670	12,914	7,595
Net cash provided by operating activities	106,933	110,946	95,412
Cash flows from investing activities:
Purchase of marketable securities	(133,212)	(128,122)	(121,133)
Proceeds from maturity of marketable securities	89,954	65,570	163,416
Purchase of fixed assets	(12,808)	(13,066)	(11,671)
Purchase of intangible assets	(174)	(1,086)	(277)
Acquisition of businesses, net of cash acquired	0	0	(51,273)
Decrease (increase) in deposits	55	123	(804)
Net cash used in investing activities	(56,185)	(76,581)	(21,742)
Cash flows from financing activities:
Issuance of common stock under stock plans	140us-gaap_ProceedsFromRepurchaseOfEquity	812us-gaap_ProceedsFromRepurchaseOfEquity	575us-gaap_ProceedsFromRepurchaseOfEquity
Payment of contingent consideration	0ntct_PaymentsOfContingentConsideration	(841)ntct_PaymentsOfContingentConsideration	(4,038)ntct_PaymentsOfContingentConsideration
Treasury stock repurchases	(51,714)	(34,322)	(27,448)
Repayment of long-term debt	0us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt	(62,000)us-gaap_RepaymentsOfLongTermDebt
Excess tax benefit from share-based compensation awards	2,814	2,388	1,907
Net cash used in financing activities	(48,760)	(31,963)	(91,004)
Effect of exchange rate changes on cash and cash equivalents	829	(256)	9
Net increase (decrease) in cash and cash equivalents	2,817	2,146	(17,325)
Cash and cash equivalents, beginning of year	102,076	99,930	117,255
Cash and cash equivalents, end of year	104,893	102,076	99,930
Supplemental disclosures of cash flow information:
Cash paid for interest	0us-gaap_InterestPaid	0us-gaap_InterestPaid	325us-gaap_InterestPaid
Cash paid for income taxes	29,233us-gaap_IncomeTaxesPaid	21,456us-gaap_IncomeTaxesPaid	13,326us-gaap_IncomeTaxesPaid
Non-cash transactions:
Transfers of inventory to fixed assets	940	1,781	583
Additions to property, plant and equipment included in accounts payable	(187)	124	154
Gross (decrease) in contractual liability relating to fair value adjustment	(49)	(197)	(184)
Gross increase (decrease) in contingent consideration liability relating to fair value adjustment	40	(106)	650
Issuance of common stock under employee stock purchase plans	$ 5,889us-gaap_StockIssued1	$ 4,995us-gaap_StockIssued1	$ 4,545us-gaap_StockIssued1

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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

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Net cash outflow or inflow from other deposits that are not separately disclosed.

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The cash outflow to reacquire common stock during the period.

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Cash outflow for purchase of trading, available-for-sale securities and held-to-maturity securities.

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