Share-Based Compensation - Share-Based Compensation and Related Tax Benefit Recognized in Condensed Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	$ 15.0	$ 11.6	$ 40.9	$ 31.8
Income tax benefit on share-based compensation	4.0	3.2	10.8	8.9
Cost of Revenue [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	0.5	0.4	1.3	1.0
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	8.1	6.4	22.1	17.8
Selling, General, and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total	$ 6.4	$ 4.8	$ 17.5	$ 13.0