Summary of Significant Accounting Policies (Details 8) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014
Additional disclosures
Common stock, shares issued	41,872,329us-gaap_CommonStockSharesIssued		41,872,329us-gaap_CommonStockSharesIssued		41,144,062us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	38,369,731us-gaap_CommonStockSharesOutstanding		38,369,731us-gaap_CommonStockSharesOutstanding		38,948,866us-gaap_CommonStockSharesOutstanding
Basic and dilutive earning (loss) per share computation:
Net income - K12	$ 17,013us-gaap_NetIncomeLoss	$ 15,949us-gaap_NetIncomeLoss	$ 22,568us-gaap_NetIncomeLoss	$ 7,244us-gaap_NetIncomeLoss
Weighted average common shares, basic	37,211,634	39,596,798	37,334,598	39,136,667
Weighted average common shares, diluted	37,408,911	39,596,798	37,574,665	39,136,667
Basic net income per share (in dollars per share)	$ 0.46us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.60us-gaap_EarningsPerShareBasic	$ 0.19us-gaap_EarningsPerShareBasic
Diluted net income per share (in dollars per share)	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.60us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted
Anti-dilutive shares	197,277	0	240,067	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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