Restructuring (Details) - Facility closing $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($) facility
Restructuring
Number of facilities being exited \| facility	3
Impairment of leases	$ 5.4
Lease liability current	1.7
Lease liability noncurrent	3.7
Accelerated depreciation	1.4
Deferred rent and tenant improvements written off	1.9
Selling, administrative and other operating expenses
Restructuring
Net impact of facility exit activity	$ 4.9

Amount of deferred rent and tenant improvements written off, resulting in income.

No definition available.

Name:	lrn_DeferredRentAndTenantImprovementsWrittenOff
Namespace Prefix:	lrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of operating lease obligation due within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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

- Definition

Amount of operating lease liability due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

+ References

No definition available.

+ Details

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

- Definition

Net impact of facility exit activity.

+ References

No definition available.

+ Details

Name:	lrn_NetImpactOfFacilityExitActivity
Namespace Prefix:	lrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the number of facilities that are being exited.

+ References

No definition available.

+ Details

Name:	lrn_NumberOfFacilitiesBeingExited
Namespace Prefix:	lrn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228

+ Details

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

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

- Definition

Amount of accelerated depreciation charged against earnings associated with exit from or disposal of business activities or restructuring plan.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_SellingGeneralAndAdministrativeExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: