Income Taxes (Components of Deferred Income Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Net of Valuation Allowance, Current	$ 0	$ 33,000
Deferred Tax Liabilities, Net, Current	0	57,000
Accrued expenses not currently deductible	262,800	240,600
Stock-based compensation expense	74,600	72,300
Net operating losses	46,000	47,500
Other	70,800	23,500
Deferred Tax Assets, Gross	454,200	383,900
Valuation Allowance	(15,400)	(23,707)
Deferred Tax Assets, Net of Valuation Allowance	438,800	360,200
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	77,200	147,900
Deferred Revenue	43,200	36,600
Fixed and intangible assets	171,400	122,500
Prepaid expenses	118,000	108,500
Unrealized investment gains, net	176,200	71,900
Tax on unrepatriated earnings	0	5,100
Other	3,600	1,900
Deferred Tax Liabilities	589,600	494,400
Deferred Tax Liabilities, Net	$ 150,800	$ 134,200
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Jun. 30, 2035
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Jun. 30, 2036
Net operating losses	$ 50,200