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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenue recognition
Amounts recorded as revenues and school operating expenses	$ 76.1	$ 74.9	$ 139.6	$ 137.4
Reduction in school operating losses included in the entity's revenue	$ 13.7	$ 12.6	$ 31.5	$ 28.3
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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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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- 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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