Investments - Summary of Fair Value of Investments and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Marketable Securities [Line Items]
Cash and cash equivalents, Amortized Cost	$ 53,867	$ 98,719
Marketable securities, Amortized Cost	146,432	139,572
Marketable securities, Unrealized Gains		129
Marketable securities, Unrealized Losses		(89)
Marketable securities, Fair Value	146,432	139,612
Investments, Amortized Cost	168,699	170,511
Investments, Unrealized Gains		131
Investments, Unrealized Losses		(89)
Investments, Fair Value	168,699	170,553
Commercial Paper
Marketable Securities [Line Items]
Cash and cash equivalents, Amortized Cost	1,790	10,795
Cash and cash equivalents, Unrealized Gains		0
Cash and cash equivalents, Unrealized Losses		0
Cash and cash equivalents, Fair Value	1,790	10,795
Marketable securities, Amortized Cost	16,779	18,147
Marketable securities, Unrealized Gains		0
Marketable securities, Unrealized Losses		(6)
Marketable securities, Fair Value	16,779	18,141
United States Treasury Securities
Marketable Securities [Line Items]
Cash and cash equivalents, Amortized Cost		9,977
Cash and cash equivalents, Unrealized Gains		2
Cash and cash equivalents, Unrealized Losses		0
Cash and cash equivalents, Fair Value		9,979
Marketable securities, Amortized Cost	70,937	56,795
Marketable securities, Unrealized Gains		99
Marketable securities, Unrealized Losses		(4)
Marketable securities, Fair Value	70,937	56,890
Money Market Funds
Marketable Securities [Line Items]
Cash and cash equivalents, Amortized Cost	20,477	5,976
Cash and cash equivalents, Unrealized Gains		0
Cash and cash equivalents, Unrealized Losses		0
Cash and cash equivalents, Fair Value	20,477	5,976
Corporate Notes and Bonds
Marketable Securities [Line Items]
Cash and cash equivalents, Amortized Cost		3,349
Cash and cash equivalents, Unrealized Gains		0
Cash and cash equivalents, Unrealized Losses		0
Cash and cash equivalents, Fair Value		3,349
Marketable securities, Amortized Cost	25,984	26,631
Marketable securities, Unrealized Gains		14
Marketable securities, Unrealized Losses		(55)
Marketable securities, Fair Value	25,984	26,590
Cash and Cash Equivalents
Marketable Securities [Line Items]
Cash and cash equivalents, Amortized Cost	22,267	30,939
Cash and cash equivalents, Unrealized Gains		2
Cash and cash equivalents, Unrealized Losses		0
Cash and cash equivalents, Fair Value	22,267	30,941
Agency Securities
Marketable Securities [Line Items]
Cash and cash equivalents, Amortized Cost		842
Cash and cash equivalents, Unrealized Gains		0
Cash and cash equivalents, Unrealized Losses		0
Cash and cash equivalents, Fair Value		842
Marketable securities, Amortized Cost	32,732	37,999
Marketable securities, Unrealized Gains		16
Marketable securities, Unrealized Losses		(24)
Marketable securities, Fair Value	$ 32,732	$ 37,991

Cash and cash equivalents unrealized gain.

No definition available.

Name:	nxgn_CashAndCashEquivalentsUnrealizedGain
Namespace Prefix:	nxgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash and cash equivalents unrealized loss.

+ References

No definition available.

+ Details

Name:	nxgn_CashAndCashEquivalentsUnrealizedLoss
Namespace Prefix:	nxgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investments accumulated unrealized gain.

+ References

No definition available.

+ Details

Name:	nxgn_InvestmentsAccumulatedUnrealizedGain
Namespace Prefix:	nxgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Investments accumulated unrealized loss.

+ References

No definition available.

+ Details

Name:	nxgn_InvestmentsAccumulatedUnrealizedLoss
Namespace Prefix:	nxgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investments amortized cost basis.

+ References

No definition available.

+ Details

Name:	nxgn_InvestmentsAmortizedCostBasis
Namespace Prefix:	nxgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483467/210-10-45-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-4

+ Details

Name:	us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnderlyingAssetClassAxis=us-gaap_AgencySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: