Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Intangible Assets by Major Class [Line Items]
Finite lived intangible assets, amortization expense	$ 8.8	$ 6.5	$ 25.3	$ 38.3	$ 21.1
Finite-lived intangible assets, impairment charges	14.4
Future payments for royalty advances and licensed or acquired technologies	$ 67.5
Royalty advances and licensed or acquired technologies, amortization period	5 years