Stockholders' Equity (Narrative) (Details)	1 Months Ended		12 Months Ended
	Nov. 30, 2017 USD ($) shares	Oct. 31, 2017 USD ($)	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) shares	Feb. 21, 2014 shares	Apr. 30, 1997 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to be repurchased under repurchase program						20,000,000
Cost of common shares repurchased | $			$ 22,845,000	$ 53,803,000
Total number of shares repurchased pursuant to the repurchase program			41,836,234	41,636,234
Total cost of shares repurchased pursuant to the repurchase program | $			$ 1,623,256,000	$ 1,600,412,000
Additional shares that can be repurchased under the approved share repurchase program			12,900,000
Preferred stock, shares authorized			2,000,000	2,000,000			2,000,000
Preferred stock at par value | $ / shares			$ 0.01	$ 0.01			$ 0.01
Preferred stock, shares issued			0	0
Preferred stock, shares outstanding			0
Expiration period			7 years
Reduction in the number of shares of common stock available for issuance			2.8
Maximum number of shares subject to awards granted			3,000,000
Number of common stock shares granted in participant's initial year of hiring			4,500,000
Unrecognized compensation costs related to unvested stock-based compensation arrangements | $			$ 75,900,000
Expected weighted average period of unrecognized compensation costs related to unvested stock-based compensation arrangements			2 years 3 months 18 days
Aggregate intrinsic value of the stock-based compensation arrangements outstanding | $			$ 238,400,000
Aggregate intrinsic value of the stock-based compensation arrangements exercisable | $				$ 222,300,000
Aggregate intrinsic value of the options exercised | $			15,100,000	27,500,000	28,100,000
Stock-based compensation expense | $			$ 52,073,000	$ 48,412,000	$ 45,925,000
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares repurchased under repurchase program			200,000	550,000
Cost of common shares repurchased | $			$ 22,844,000	$ 53,801,000
Total number of shares repurchased pursuant to the repurchase program			41,800,000
Total cost of shares repurchased pursuant to the repurchase program | $			$ 1,600,000,000
Shares issued under Employee Stock Purchase Plan
2009 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum amount payable pursant to cash denominated performance awards granted | $	$ 5,000,000	$ 3,000,000
Vesting period	4 years
Expiration date	Sep. 11, 2027
Common stock authorized for issuance			51,100,000
Common stock authorized for issuance and pending registration	7,400,000
Number of securities remaining available for future issuance			16,300,000
2009 Plan [Member] | Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum award amount with other cash fees earned for services | $	$ 700,000
2009 Plan [Member] | Board Of Directors Chairman [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum award amount with other cash fees earned for services | $	$ 1,200,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of securities remaining available for future issuance			2,400,000
Shares issued under Employee Stock Purchase Plan			285,000	302,000
Percentage of purchase price of common stock lower than the fair market value of common stock on the date of grant			85.00%
Percentage of purchase price of common stock lower than the fair market value of common stock on the date of purchase			85.00%
Stock-based compensation expense | $			$ 6,400,000	$ 5,200,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Minimum [Member] | Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase program offering period			3 months
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Maximum [Member] | Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase program offering period			27 months
Common stock shares subscribed | $			$ 25,000