CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	Total	Common stock	Treasury stock, at cost	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Beginning Balance at Jun. 30, 2010	$ 833.9	$ 29.8	$ (34.3)	$ 435.5	$ 409.0	$ (6.1)
Beginning Balance (in shares) at Jun. 30, 2010		59.7	(0.9)
Vesting of restricted stock and exercise of stock options and related tax benefits (in shares)			0.8
Purchase of treasury shares (in shares)			(2.8)
Comprehensive income:
Net income	81.0				81.0
Foreign currency translation adjustment	9.2					9.2
Comprehensive income	90.2
Vesting of restricted stock and exercise of stock options and related tax benefits	14.6		30.9	(16.3)
Purchase of treasury shares	(101.5)		(101.5)
Share-based payment expense	18.7			18.7
Ending Balance at Jun. 30, 2011	855.9	29.8	(104.9)	437.9	490.0	3.1
Ending Balance (in shares) at Jun. 30, 2011		59.7	(2.9)
Vesting of restricted stock and exercise of stock options and related tax benefits (in shares)			0.4
Purchase of treasury shares (in shares)			(2.4)
Comprehensive income:
Net income	64.1				64.1
Foreign currency translation adjustment	(9.9)					(9.9)
Comprehensive income	54.2
Vesting of restricted stock and exercise of stock options and related tax benefits	1.0		11.2	(10.2)
Purchase of treasury shares	(50.4)		(50.4)
Share-based payment expense	15.8			15.8
Impact of ASU 2010-16 accounting change on WAP base jackpot liabilities	0.8				0.8
Ending Balance at Jun. 30, 2012	877.3	29.8	(144.1)	443.5	554.9	(6.8)
Ending Balance (in shares) at Jun. 30, 2012		59.7	(4.9)
Vesting of restricted stock and exercise of stock options and related tax benefits (in shares)			0.4
Purchase of treasury shares (in shares)			(0.3)
Comprehensive income:
Net income	34.6				34.6
Foreign currency translation adjustment	1.9					1.9
Comprehensive income	36.5
Vesting of restricted stock and exercise of stock options and related tax benefits	4.3		11.9	(7.6)
Purchase of treasury shares	(5.0)		(5.0)
Share-based payment expense	15.9			15.9
Ending Balance at Jun. 30, 2013	$ 929.0	$ 29.8	$ (137.2)	$ 451.8	$ 589.5	$ (4.9)
Ending Balance (in shares) at Jun. 30, 2013		59.7	(4.8)