Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Income Tax Disclosure [Abstract]
Accrued expenses not currently deductible	$ 240,600	$ 216,700
Stock-based compensation expense	72,300	75,600
Net operating losses	47,500	59,600
Other	23,500	31,400
Deferred Tax Assets, Gross	383,900	383,300
Valuation Allowance	(23,707)	(35,542)	$ (33,724)	$ (39,116)
Deferred Tax Assets, Net of Valuation Allowance	360,200	347,800
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	147,900	183,700
Deferred Revenue	36,600	42,500
Fixed and intangible assets	122,500	116,100
Prepaid expenses	108,500	98,500
Unrealized investment gains, net	71,900	112,300
Tax on unrepatriated earnings	5,100	14,100
Other	1,900	0
Deferred Tax Liabilities	494,400	567,200
Deferred Tax Liabilities, Net	$ 134,200	$ 219,400