Deferred Income Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2012
Current:
Receivables valuation allowances	$ 3.9	$ 1.3
Inventory valuation reserves	0.8	1.6
Accrued liabilities and other items not currently deductible	11.8	3.6
Total current deferred income tax assets (included in other current assets)	16.5	6.5
Non-current:
Share-based payment expense	21.9	18.7
Book over tax depreciation	16.1	10.8
Other non-current	9.8	9.8
Foreign net operating loss	1.3
Other	0.5
Total non-current deferred income tax assets	49.6	39.3
Valuation allowance, relating to foreign net operating loss	(1.3)
Net deferred tax assets	64.8	45.8
Deferred income tax liabilities resulting from:
Capitalized regulatory approval and internal use software development costs	(16.6)	(16.0)
Capitalized patents and trademarks	(8.3)	(5.9)
Other		(0.8)
Total non-current deferred income tax liabilities	(24.9)	(22.7)
Total net deferred income tax assets	$ 39.9	$ 23.1