Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 40,338us-gaap_NetIncomeLoss	$ 32,430us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	14,449	13,774
Loss on disposal of fixed assets	536	38
Deal related compensation expense and accretion charges	114	114
Share-based compensation expense associated with equity awards	11,947us-gaap_ShareBasedCompensation	9,959us-gaap_ShareBasedCompensation
Net change in fair value of contingent and contractual liabilities	(9)	(289)
Deferred income taxes	2,151us-gaap_DeferredIncomeTaxExpenseBenefit	4,259us-gaap_DeferredIncomeTaxExpenseBenefit
Other losses (gains)	84us-gaap_OtherNoncashIncomeExpense	(69)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities
Accounts receivable	(22,973)	(302)
Inventories	1,359us-gaap_IncreaseDecreaseInInventories	(5,346)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(143)	1,345
Accounts payable	(700)	(1,255)
Accrued compensation and other expenses	10,132	2,259
Income taxes payable	(791)	591
Deferred revenue	828	3,259
Net cash provided by operating activities	57,322	60,767
Cash flows from investing activities:
Purchase of marketable securities	(78,547)	(88,802)
Proceeds from maturity of marketable securities	61,189	49,405
Purchase of fixed assets	(8,630)	(8,709)
Purchase of intangible assets	(131)	(713)
Decrease in deposits	103	37
Net cash used in investing activities	(26,016)	(48,782)
Cash flows from financing activities:
Issuance of common stock under stock plans	105	755
Payment of contingent consideration	0ntct_PaymentsOfContingentConsideration	(841)ntct_PaymentsOfContingentConsideration
Treasury stock repurchases	(31,543)	(25,033)
Excess tax benefit from share-based compensation awards	4,322	2,039
Net cash used in financing activities	(27,116)	(23,080)
Effect of exchange rate changes on cash and cash equivalents	438	(187)
Net increase (decrease) in cash and cash equivalents	4,628	(11,282)
Cash and cash equivalents, beginning of period	102,076	99,930
Cash and cash equivalents, end of period	106,704	88,648
Supplemental disclosures:
Cash paid for income taxes	20,830us-gaap_IncomeTaxesPaid	12,628us-gaap_IncomeTaxesPaid
Non-cash transactions:
Transfers of inventory to fixed assets	940	1,781
Additions to property, plant and equipment included in accounts payable	380	233
Gross decrease in contractual liability relating to fair value adjustment	(49)	(148)
Gross increase (decrease) in contingent consideration liability relating to fair value adjustment	40	(141)
Issuance of common stock under employee stock plans	$ 2,760us-gaap_StockIssued1	$ 2,230us-gaap_StockIssued1

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

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-Publisher FASB

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-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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- Definition

The fair value of stock issued in noncash financing activities.

+ References

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