Stockholders' Equity (Narrative) (Details)		1 Months Ended	12 Months Ended
	Nov. 30, 2017 USD ($) shares	Nov. 30, 2017 USD ($) shares	Jun. 30, 2020 USD ($) item $ / shares shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 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 | shares						20,000,000.0
Cost of common shares repurchased | $				$ 22,845,000	$ 53,803,000
Total number of shares repurchased pursuant to the repurchase program | shares			41,836,234	41,836,234
Total cost of shares repurchased pursuant to the repurchase program | $			$ 1,623,256,000	$ 1,623,256,000
Additional shares that can be repurchased under the approved share repurchase program | shares			12,900,000
Preferred stock, shares authorized | shares			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 | shares			0	0
Preferred stock, shares outstanding | shares			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 | shares			3,000,000
Number of common stock shares granted in participant's initial year of hiring | shares			4,500,000
Fair value of RSUs and PRSUs | $			$ 56,800,000	$ 52,300,000	34,600,000
Aggregate intrinsic value of the options exercised | $			31,200,000	$ 15,100,000	$ 27,500,000
Aggregate intrinsic value of the stock-based compensation arrangements outstanding | $			110,000,000.0
Aggregate intrinsic value of the stock-based compensation arrangements exercisable | $			77,400,000
Aggregate intrinsic value of the stock-based compensation arrangements exercisable, vested and expected to vest | $			$ 108,500,000
Shares issued under Employee Stock Purchase Plan | shares			265,000	285,000	302,000
Number of offerings for Employee Stock Purchase Plan | item			2
Stock-based compensation expense | $			$ 57,559,000	$ 52,073,000	$ 48,412,000
Unrecognized compensation costs related to unvested stock-based compensation arrangements | $			$ 92,600,000
Expected weighted average period of unrecognized compensation costs related to unvested stock-based compensation arrangements			2 years 2 months 12 days
Treasury Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares repurchased under repurchase program | shares				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 | shares			41,800,000
Total cost of shares repurchased pursuant to the repurchase program | $			$ 1,600,000,000
Shares issued under Employee Stock Purchase Plan | shares
2009 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Extended period		4 years
Expiration date		Sep. 11, 2027
Common stock authorized for issuance | shares			51,100,000
Common stock authorized for issuance and pending registration | shares	7,400,000	7,400,000
Number of securities remaining available for future issuance | shares			15,800,000
Amended And Restated 2009 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum amount payable pursant to cash denominated performance awards granted | $	$ 3,000,000.0	$ 5,000,000.0
Amended And Restated 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
Amended And Restated 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 | shares			2,000,000.0
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 | $			$ 8,000,000.0	$ 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
Performance Restricted Stock Units (PRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Maximum amount to be issued under award, percentage			225.00%