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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Revenue recognition
Amounts recorded as revenues and school operating expenses	$ 314.8	$ 292.0	$ 294.7
Percentage of impact on total revenue		(0.30%)	(0.10%)	0.40%
Reduction in school operating losses included in the entity's revenue	$ 66.7	$ 61.0	$ 57.1
Minimum
Revenue recognition
Duration of contracts providing access to curriculum via the entity's Web site	1 year
Maximum
Revenue recognition
Duration of contracts providing access to curriculum via the entity's Web site	2 years

X

- Definition

The duration of contracts providing access to curriculum via the entity's Web site. The entity recognizes revenues over the term of the contract.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Represents the percentage of impact on total revenue due to aggregate funding estimates differed from actual reimbursements.

+ References

No definition available.

+ Details

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X

- Definition

Represents the reduction in revenue attributable to school operating losses at schools where the reporting entity provides turnkey management services.

+ References

No definition available.

+ Details

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Namespace Prefix:	lrn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- References

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- Definition

Cost associated with reimbursable income. This occurs when a services entity incurs expenses on behalf of the client and passes through the cost of reimbursable expenses to a client.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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