Financial Instruments And Fair Value Measurements (Narrative) (Details) (USD $)	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit based OTTI losses recorded in Statement of Operations	$ 4,000,000	$ 4,293,000	$ 4,783,000
Cumulative impairment losses recorded in AOCI	4,300,000	6,300,000
Cumulative impairment losses recorded in AOCI, net of tax	2,700,000	3,900,000
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction rate securities, interest rate setting interval (in days)	7 days
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction rate securities, interest rate setting interval (in days)	35 days
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cumulative impairment losses, investments	18,300,000	16,300,000
Cumulative other-than-temporary impairment losses, investments	14,000,000	10,000,000
Student Loans Guaranteed By FFELP [Member] | Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction rate securities, fair value	29,800,000
Aggregate discount from cost, percentage	9.00%
Student Loans Guaranteed By AMBAC [Member] | Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction rate securities, fair value	$ 4,500,000
Aggregate discount from cost, percentage	55.00%