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Commitments and Contingencies (Details) $ in Millions	6 Months Ended
	Dec. 31, 2017 USD ($)	Oct. 02, 2017 item	Jul. 20, 2016 item
Buildings of Flex schools
Commitments and contingencies
Guarantees related to lease commitments | $	$ 2.3
Employment agreement with Executive Chairman
Commitments and contingencies
Term of agreement	2 years
Employment agreement
Commitments and contingencies
Term of agreement	3 years
Babulal Tarapara Vs K12 Inc.
Commitments and contingencies
Number of officers against whom lawsuit is filed			2
Number of former officers against whom lawsuit is filed			1
Number of former officers who were dismissed as defendants in the lawsuit		2

X

- Definition

Represents the term of the agreement.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The number of former officers of the reporting entity against whom securities class action lawsuit is filed.

+ References

No definition available.

+ Details

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Namespace Prefix:	lrn_
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X

- Definition

The number of former officers of the reporting entity who were dismissed as defendants in the lawsuit.

+ References

No definition available.

+ Details

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- Definition

The number of officers against whom securities class action lawsuit is filed.

+ References

No definition available.

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X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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Period Type:	instant

X

- 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

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- Details

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- Details

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- Details

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- Details

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