Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2020 USD ($) installment	Mar. 27, 2020
Commitments and contingencies
Employer portion of social security payroll tax percentage		6.20%
Deferred amount of employer portion of social security payroll tax	$ 14.1
Number of installments that deferred employer social security payroll taxes will be repaid \| installment	2
Percentage of deferred social security employer payroll tax to be paid by prescribed dates to be considered timely	50.00%
Buildings
Commitments and contingencies
Guarantees related to lease commitments	$ 0.7

Represents the employer portion of social security payroll tax percentage.

No definition available.

Name:	lrn_EmployerPortionOfSocialSecurityPayrollTaxPercentage
Namespace Prefix:	lrn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of the deferred social security employer payroll tax to be paid by prescribed dates to be considered timely.

+ References

No definition available.

+ Details

Name:	lrn_PercentageOfEmployerSocialSecurityPayrollTaxDefermentToBePaidByPrescribedDatesToBeConsideredTimely
Namespace Prefix:	lrn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the employer portion of the social security payroll tax deferred under the CARES Act.

+ References

No definition available.

+ Details

Name:	lrn_SocialSecurityEmployerPayrollTaxAmountDeferredUnderCaresAct
Namespace Prefix:	lrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the number of installments that deferred employer social security payroll taxes will be repaid.

+ References

No definition available.

+ Details

Name:	lrn_SocialSecurityEmployerPayrollTaxDefermentNumberOfInstallmentPayments
Namespace Prefix:	lrn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: