Commitments [Line Items]

No definition available.

Name:	chng_CommitmentsLineItems
Namespace Prefix:	chng_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of Agreement Renewal Options

+ References

No definition available.

+ Details

Name:	chng_NumberOfAgreementRenewalOptions
Namespace Prefix:	chng_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Shortfall Required if Minimum Purchase Commitment not Met

+ References

No definition available.

+ Details

Name:	chng_PercentageShortfallRequiredIfMinimumPurchaseCommitmentNotMet
Namespace Prefix:	chng_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Renewal Option Term

+ References

No definition available.

+ Details

Name:	chng_RenewalOptionTerm
Namespace Prefix:	chng_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_OtherCommitmentsAxis=chng_MasterServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=chng_JointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments (Narrative) (Details) $ in Thousands	1 Months Ended		12 Months Ended
Commitments (Narrative) (Details) $ in Thousands	Mar. 31, 2020 USD ($)	Feb. 28, 2018 USD ($) item	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)
Commitments [Line Items]
Rent expense			$ 3,048	$ 0	$ 0
Master Services Agreement [Member]
Commitments [Line Items]
Commitment term		10 years
Number of agreement renewal options \| item		3
Renewal option term		1 year
Percentage shortfall required if minimum commitment not met		25.00%
Purchase commitment amount		$ 1,000,000
Minimum [Member] \| Master Services Agreement [Member]
Commitments [Line Items]
Purchase commitment amount	$ 975,000
Maximum [Member]
Commitments [Line Items]
Lease expiration			Dec. 31, 2029
Joint Venture [Member] \| Master Services Agreement [Member]
Commitments [Line Items]
Commitment term		10 years