Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2010	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2012 Minimum [Member] Leasehold Improvements [Member]	Jun. 30, 2012 Minimum [Member] All other Property and Equipment [Member]	Jun. 30, 2012 Maximum [Member]	Jun. 30, 2012 Maximum [Member] Building [Member]	Jun. 30, 2012 Maximum [Member] Leasehold Improvements [Member]	Jun. 30, 2012 Maximum [Member] All other Property and Equipment [Member]	Jun. 30, 2012 Tuition and Fees [Member] Revenue, Net [Member]	Jun. 30, 2011 Tuition and Fees [Member] Revenue, Net [Member]	Jun. 30, 2010 Tuition and Fees [Member] Revenue, Net [Member]	Jun. 30, 2011 Interest Rate Swap [Member] Derivatives	Apr. 30, 2011 Interest Rate Swap [Member] Derivatives
Restricted Cash and Cash Equivalents Items [Line Items]
Number of Interest Rate Derivatives Held																2	3
Cash secured letters of credit	$ 210,000,000	[1]	$ 0	[1]
Title IV funds in excess of charges applied	54,416,000		43,330,000
Escrowed in connection with operating lease	1,464,000		2,183,000
Endowments	2,000,000		2,000,000
Restricted cash	267,880,000		47,513,000
Period of academic term	P16W
Receivables aging past due	4 months
Property and equipment useful life							7 years	3 years		30 years	15 years	10 years
Lease agreements, term						5 years			15 years
Percentage of revenues from tuition and fees													93.10%	92.50%	92.50%
Marketing expense	$ 296,900,000		$ 300,000,000		$ 259,700,000

[1] During fiscal 2012, the Company entered into two cash secured letter of credit facilities pursuant to which the lenders agreed to issue letters of credit to the U.S. Department of Education. Refer to Note 8, "Short-Term and Long-Term Debt" for more details.