Consolidated Statements Of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance, value at Jun. 30, 2014	$ 577.7	$ 0.5	$ 0.0	$ 575.1	$ 2.1
Beginning Balance, Shares at Jun. 30, 2014		54.7
Shares issued under stock option/restricted stock/employee stock purchase plans, net, Shares		0.9
Shares issued under stock option/restricted stock/employee stock purchase plans, net	12.7	$ 0.1	12.6
Stock-based compensation	17.9		17.9
Excess tax benefit related to employee equity awards	7.2		7.2
Stock Repurchase, Shares		(0.4)
Adoption of ASU 2016-09	0.0		0.0	0.0
Unrealized gain (loss) on derivative instruments, net of taxes	(3.9)				(3.9)
Foreign currency translation adjustment	(94.1)				(94.1)
Net income	147.8			147.8
Ending Balance, Shares at Jun. 30, 2015		55.2
Ending Balance, value at Jun. 30, 2015	665.3	$ 0.6	37.7	722.9	(95.9)
Shares issued under stock option/restricted stock/employee stock purchase plans, net, Shares		0.9
Shares issued under stock option/restricted stock/employee stock purchase plans, net	13.9	$ 0.0	13.9
Stock-based compensation	20.1		20.1
Excess tax benefit related to employee equity awards	19.3		4.0	15.3
Stock Repurchase, Shares		(3.2)
Adoption of ASU 2016-09	(200.0)	$ (0.1)	(44.3)	(155.6)
Unrealized gain (loss) on derivative instruments, net of taxes	(5.8)				(5.8)
Foreign currency translation adjustment	(34.3)				(34.3)
Net income	$ 154.9			154.9
Ending Balance, Shares at Jun. 30, 2016	52.9	52.9
Ending Balance, value at Jun. 30, 2016	$ 633.4	$ 0.5	31.4	737.5	(136.0)
Shares issued under stock option/restricted stock/employee stock purchase plans, net, Shares		1.3
Shares issued under stock option/restricted stock/employee stock purchase plans, net	34.2		34.2
Stock-based compensation	22.1		22.1
Excess tax benefit related to employee equity awards	1.0		1.0	0.0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0.0		(0.6)	0.6
Stock Repurchase, Shares		(3.1)
Adoption of ASU 2016-09	(179.3)	$ 0.0	(67.3)	(112.0)
Unrealized gain (loss) on derivative instruments, net of taxes	8.6				8.6
Foreign currency translation adjustment	7.2				7.2
Net income	$ 107.3			107.3
Ending Balance, Shares at Jun. 30, 2017	51.1	51.1
Ending Balance, value at Jun. 30, 2017	$ 634.5	$ 0.5	$ 22.0	$ 732.2	$ (120.2)